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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[deliverable/linux.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
65f73508 26#include <linux/gpio.h>
778b28b4 27#include <linux/gpio/consumer.h>
69511a45 28#include <linux/of.h>
65b19ce6 29#include <linux/regmap.h>
69511a45 30#include <linux/regulator/of_regulator.h>
414c70cb
LG		 31#include <linux/regulator/consumer.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
65602c32 34#include <linux/module.h>
414c70cb 35
02fa3ec0
MB		 36#define CREATE_TRACE_POINTS
37#include <trace/events/regulator.h>
38
34abbd68 39#include "dummy.h"
0cdfcc0f 40#include "internal.h"
34abbd68 41
7d51a0db
MB		 42#define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 44#define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50#define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52
414c70cb 53static DEFINE_MUTEX(regulator_list_mutex);
414c70cb 54static LIST_HEAD(regulator_map_list);
f19b00da 55static LIST_HEAD(regulator_ena_gpio_list);
a06ccd9c 56static LIST_HEAD(regulator_supply_alias_list);
21cf891a 57static bool has_full_constraints;
414c70cb 58
1130e5b3 59static struct dentry *debugfs_root;
1130e5b3 60
85f3b431
TV		 61static struct class regulator_class;
62
8dc5390d 63/*
414c70cb
LG		 64 * struct regulator_map
65 *
66 * Used to provide symbolic supply names to devices.
67 */
68struct regulator_map {
69 struct list_head list;
40f9244f 70 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 71 const char *supply;
a5766f11 72 struct regulator_dev *regulator;
414c70cb
LG		 73};
74
f19b00da
KM		 75/*
76 * struct regulator_enable_gpio
77 *
78 * Management for shared enable GPIO pin
79 */
80struct regulator_enable_gpio {
81 struct list_head list;
778b28b4 82 struct gpio_desc *gpiod;
f19b00da
KM		 83 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
86};
87
a06ccd9c
CK		 88/*
89 * struct regulator_supply_alias
90 *
91 * Used to map lookups for a supply onto an alternative device.
92 */
93struct regulator_supply_alias {
94 struct list_head list;
95 struct device *src_dev;
96 const char *src_supply;
97 struct device *alias_dev;
98 const char *alias_supply;
99};
100
414c70cb 101static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 102static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 103static int _regulator_get_voltage(struct regulator_dev *rdev);
104static int _regulator_get_current_limit(struct regulator_dev *rdev);
105static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
7179569a 106static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb 107 unsigned long event, void *data);
75790251
MB		 108static int _regulator_do_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV);
3801b86a
MB		 110static struct regulator *create_regulator(struct regulator_dev *rdev,
111 struct device *dev,
112 const char *supply_name);
36a1f1b6 113static void _regulator_put(struct regulator *regulator);
414c70cb 114
609ca5f3
MB		 115static struct regulator_dev *dev_to_rdev(struct device *dev)
116{
117 return container_of(dev, struct regulator_dev, dev);
118}
414c70cb 119
1083c393
MB		 120static const char *rdev_get_name(struct regulator_dev *rdev)
121{
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
126 else
127 return "";
128}
129
87b28417
MB		 130static bool have_full_constraints(void)
131{
75bc9641 132 return has_full_constraints || of_have_populated_dt();
87b28417
MB		 133}
134
70a7fb80
TR		 135static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
136{
137 if (rdev && rdev->supply)
138 return rdev->supply->rdev;
139
140 return NULL;
141}
142
9f01cd4a
SH		 143/**
144 * regulator_lock_supply - lock a regulator and its supplies
145 * @rdev: regulator source
146 */
147static void regulator_lock_supply(struct regulator_dev *rdev)
148{
fa731ac7 149 int i;
9f01cd4a 150
70a7fb80 151 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
fa731ac7 152 mutex_lock_nested(&rdev->mutex, i);
9f01cd4a
SH		 153}
154
155/**
156 * regulator_unlock_supply - unlock a regulator and its supplies
157 * @rdev: regulator source
158 */
159static void regulator_unlock_supply(struct regulator_dev *rdev)
160{
161 struct regulator *supply;
162
163 while (1) {
164 mutex_unlock(&rdev->mutex);
165 supply = rdev->supply;
166
167 if (!rdev->supply)
168 return;
169
170 rdev = supply->rdev;
171 }
172}
173
69511a45
RN		 174/**
175 * of_get_regulator - get a regulator device node based on supply name
176 * @dev: Device pointer for the consumer (of regulator) device
177 * @supply: regulator supply name
178 *
179 * Extract the regulator device node corresponding to the supply name.
167d41dc 180 * returns the device node corresponding to the regulator if found, else
69511a45
RN		 181 * returns NULL.
182 */
183static struct device_node *of_get_regulator(struct device *dev, const char *supply)
184{
185 struct device_node *regnode = NULL;
186 char prop_name[32]; /* 32 is max size of property name */
187
188 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
189
190 snprintf(prop_name, 32, "%s-supply", supply);
191 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
192
193 if (!regnode) {
16fbcc3b 194 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 195 prop_name, dev->of_node->full_name);
196 return NULL;
197 }
198 return regnode;
199}
200
6492bc1b
MB		 201static int _regulator_can_change_status(struct regulator_dev *rdev)
202{
203 if (!rdev->constraints)
204 return 0;
205
206 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
207 return 1;
208 else
209 return 0;
210}
211
414c70cb
LG		 212/* Platform voltage constraint check */
213static int regulator_check_voltage(struct regulator_dev *rdev,
214 int *min_uV, int *max_uV)
215{
216 BUG_ON(*min_uV > *max_uV);
217
218 if (!rdev->constraints) {
5da84fd9 219 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 220 return -ENODEV;
221 }
222 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
7ebcf26c 223 rdev_err(rdev, "voltage operation not allowed\n");
414c70cb
LG		 224 return -EPERM;
225 }
226
227 if (*max_uV > rdev->constraints->max_uV)
228 *max_uV = rdev->constraints->max_uV;
229 if (*min_uV < rdev->constraints->min_uV)
230 *min_uV = rdev->constraints->min_uV;
231
89f425ed
MB		 232 if (*min_uV > *max_uV) {
233 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 234 *min_uV, *max_uV);
414c70cb 235 return -EINVAL;
89f425ed 236 }
414c70cb
LG		 237
238 return 0;
239}
240
05fda3b1
TP		 241/* Make sure we select a voltage that suits the needs of all
242 * regulator consumers
243 */
244static int regulator_check_consumers(struct regulator_dev *rdev,
245 int *min_uV, int *max_uV)
246{
247 struct regulator *regulator;
248
249 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 250 /*
251 * Assume consumers that didn't say anything are OK
252 * with anything in the constraint range.
253 */
254 if (!regulator->min_uV && !regulator->max_uV)
255 continue;
256
05fda3b1
TP		 257 if (*max_uV > regulator->max_uV)
258 *max_uV = regulator->max_uV;
259 if (*min_uV < regulator->min_uV)
260 *min_uV = regulator->min_uV;
261 }
262
dd8004af 263 if (*min_uV > *max_uV) {
9c7b4e8a
RD		 264 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
265 *min_uV, *max_uV);
05fda3b1 266 return -EINVAL;
dd8004af 267 }
05fda3b1
TP		 268
269 return 0;
270}
271
414c70cb
LG		 272/* current constraint check */
273static int regulator_check_current_limit(struct regulator_dev *rdev,
274 int *min_uA, int *max_uA)
275{
276 BUG_ON(*min_uA > *max_uA);
277
278 if (!rdev->constraints) {
5da84fd9 279 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 280 return -ENODEV;
281 }
282 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
7ebcf26c 283 rdev_err(rdev, "current operation not allowed\n");
414c70cb
LG		 284 return -EPERM;
285 }
286
287 if (*max_uA > rdev->constraints->max_uA)
288 *max_uA = rdev->constraints->max_uA;
289 if (*min_uA < rdev->constraints->min_uA)
290 *min_uA = rdev->constraints->min_uA;
291
89f425ed
MB		 292 if (*min_uA > *max_uA) {
293 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 294 *min_uA, *max_uA);
414c70cb 295 return -EINVAL;
89f425ed 296 }
414c70cb
LG		 297
298 return 0;
299}
300
301/* operating mode constraint check */
2c608234 302static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 303{
2c608234 304 switch (*mode) {
e573520b
DB		 305 case REGULATOR_MODE_FAST:
306 case REGULATOR_MODE_NORMAL:
307 case REGULATOR_MODE_IDLE:
308 case REGULATOR_MODE_STANDBY:
309 break;
310 default:
89f425ed 311 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 312 return -EINVAL;
313 }
314
414c70cb 315 if (!rdev->constraints) {
5da84fd9 316 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 317 return -ENODEV;
318 }
319 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
7ebcf26c 320 rdev_err(rdev, "mode operation not allowed\n");
414c70cb
LG		 321 return -EPERM;
322 }
2c608234
MB		 323
324 /* The modes are bitmasks, the most power hungry modes having
325 * the lowest values. If the requested mode isn't supported
326 * try higher modes. */
327 while (*mode) {
328 if (rdev->constraints->valid_modes_mask & *mode)
329 return 0;
330 *mode /= 2;
414c70cb 331 }
2c608234
MB		 332
333 return -EINVAL;
414c70cb
LG		 334}
335
336/* dynamic regulator mode switching constraint check */
337static int regulator_check_drms(struct regulator_dev *rdev)
338{
339 if (!rdev->constraints) {
5da84fd9 340 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 341 return -ENODEV;
342 }
343 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
7ebcf26c 344 rdev_dbg(rdev, "drms operation not allowed\n");
414c70cb
LG		 345 return -EPERM;
346 }
347 return 0;
348}
349
414c70cb
LG		 350static ssize_t regulator_uV_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
a5766f11 353 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 354 ssize_t ret;
355
356 mutex_lock(&rdev->mutex);
357 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
358 mutex_unlock(&rdev->mutex);
359
360 return ret;
361}
7ad68e2f 362static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 363
364static ssize_t regulator_uA_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366{
a5766f11 367 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 368
369 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
370}
7ad68e2f 371static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 372
587cea27
GKH		 373static ssize_t name_show(struct device *dev, struct device_attribute *attr,
374 char *buf)
bc558a60
MB		 375{
376 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 377
1083c393 378 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60 379}
587cea27 380static DEVICE_ATTR_RO(name);
bc558a60 381
4fca9545 382static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 383{
414c70cb
LG		 384 switch (mode) {
385 case REGULATOR_MODE_FAST:
386 return sprintf(buf, "fast\n");
387 case REGULATOR_MODE_NORMAL:
388 return sprintf(buf, "normal\n");
389 case REGULATOR_MODE_IDLE:
390 return sprintf(buf, "idle\n");
391 case REGULATOR_MODE_STANDBY:
392 return sprintf(buf, "standby\n");
393 }
394 return sprintf(buf, "unknown\n");
395}
396
4fca9545
DB		 397static ssize_t regulator_opmode_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
414c70cb 399{
a5766f11 400 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 401
4fca9545
DB		 402 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
403}
7ad68e2f 404static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 405
406static ssize_t regulator_print_state(char *buf, int state)
407{
414c70cb
LG		 408 if (state > 0)
409 return sprintf(buf, "enabled\n");
410 else if (state == 0)
411 return sprintf(buf, "disabled\n");
412 else
413 return sprintf(buf, "unknown\n");
414}
415
4fca9545
DB		 416static ssize_t regulator_state_show(struct device *dev,
417 struct device_attribute *attr, char *buf)
418{
419 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 420 ssize_t ret;
421
422 mutex_lock(&rdev->mutex);
423 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
424 mutex_unlock(&rdev->mutex);
4fca9545 425
9332546f 426 return ret;
4fca9545 427}
7ad68e2f 428static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 429
853116a1
DB		 430static ssize_t regulator_status_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 struct regulator_dev *rdev = dev_get_drvdata(dev);
434 int status;
435 char *label;
436
437 status = rdev->desc->ops->get_status(rdev);
438 if (status < 0)
439 return status;
440
441 switch (status) {
442 case REGULATOR_STATUS_OFF:
443 label = "off";
444 break;
445 case REGULATOR_STATUS_ON:
446 label = "on";
447 break;
448 case REGULATOR_STATUS_ERROR:
449 label = "error";
450 break;
451 case REGULATOR_STATUS_FAST:
452 label = "fast";
453 break;
454 case REGULATOR_STATUS_NORMAL:
455 label = "normal";
456 break;
457 case REGULATOR_STATUS_IDLE:
458 label = "idle";
459 break;
460 case REGULATOR_STATUS_STANDBY:
461 label = "standby";
462 break;
f59c8f9f
MB		 463 case REGULATOR_STATUS_BYPASS:
464 label = "bypass";
465 break;
1beaf762
KG		 466 case REGULATOR_STATUS_UNDEFINED:
467 label = "undefined";
468 break;
853116a1
DB		 469 default:
470 return -ERANGE;
471 }
472
473 return sprintf(buf, "%s\n", label);
474}
475static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
476
414c70cb
LG		 477static ssize_t regulator_min_uA_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
a5766f11 480 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 481
482 if (!rdev->constraints)
483 return sprintf(buf, "constraint not defined\n");
484
485 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
486}
7ad68e2f 487static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 488
489static ssize_t regulator_max_uA_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491{
a5766f11 492 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 493
494 if (!rdev->constraints)
495 return sprintf(buf, "constraint not defined\n");
496
497 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
498}
7ad68e2f 499static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 500
501static ssize_t regulator_min_uV_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
a5766f11 504 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 505
506 if (!rdev->constraints)
507 return sprintf(buf, "constraint not defined\n");
508
509 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
510}
7ad68e2f 511static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 512
513static ssize_t regulator_max_uV_show(struct device *dev,
514 struct device_attribute *attr, char *buf)
515{
a5766f11 516 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 517
518 if (!rdev->constraints)
519 return sprintf(buf, "constraint not defined\n");
520
521 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
522}
7ad68e2f 523static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 524
525static ssize_t regulator_total_uA_show(struct device *dev,
526 struct device_attribute *attr, char *buf)
527{
a5766f11 528 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 529 struct regulator *regulator;
530 int uA = 0;
531
532 mutex_lock(&rdev->mutex);
533 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 534 uA += regulator->uA_load;
414c70cb
LG		 535 mutex_unlock(&rdev->mutex);
536 return sprintf(buf, "%d\n", uA);
537}
7ad68e2f 538static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb 539
587cea27
GKH		 540static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
541 char *buf)
414c70cb 542{
a5766f11 543 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 544 return sprintf(buf, "%d\n", rdev->use_count);
545}
587cea27 546static DEVICE_ATTR_RO(num_users);
414c70cb 547
587cea27
GKH		 548static ssize_t type_show(struct device *dev, struct device_attribute *attr,
549 char *buf)
414c70cb 550{
a5766f11 551 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 552
553 switch (rdev->desc->type) {
554 case REGULATOR_VOLTAGE:
555 return sprintf(buf, "voltage\n");
556 case REGULATOR_CURRENT:
557 return sprintf(buf, "current\n");
558 }
559 return sprintf(buf, "unknown\n");
560}
587cea27 561static DEVICE_ATTR_RO(type);
414c70cb
LG		 562
563static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565{
a5766f11 566 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 567
414c70cb
LG		 568 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
569}
7ad68e2f
DB		 570static DEVICE_ATTR(suspend_mem_microvolts, 0444,
571 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 572
573static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
574 struct device_attribute *attr, char *buf)
575{
a5766f11 576 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 577
414c70cb
LG		 578 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
579}
7ad68e2f
DB		 580static DEVICE_ATTR(suspend_disk_microvolts, 0444,
581 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 582
583static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
584 struct device_attribute *attr, char *buf)
585{
a5766f11 586 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 587
414c70cb
LG		 588 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
589}
7ad68e2f
DB		 590static DEVICE_ATTR(suspend_standby_microvolts, 0444,
591 regulator_suspend_standby_uV_show, NULL);
414c70cb 592
414c70cb
LG		 593static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
594 struct device_attribute *attr, char *buf)
595{
a5766f11 596 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 597
4fca9545
DB		 598 return regulator_print_opmode(buf,
599 rdev->constraints->state_mem.mode);
414c70cb 600}
7ad68e2f
DB		 601static DEVICE_ATTR(suspend_mem_mode, 0444,
602 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 603
604static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
605 struct device_attribute *attr, char *buf)
606{
a5766f11 607 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 608
4fca9545
DB		 609 return regulator_print_opmode(buf,
610 rdev->constraints->state_disk.mode);
414c70cb 611}
7ad68e2f
DB		 612static DEVICE_ATTR(suspend_disk_mode, 0444,
613 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 614
615static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
616 struct device_attribute *attr, char *buf)
617{
a5766f11 618 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 619
4fca9545
DB		 620 return regulator_print_opmode(buf,
621 rdev->constraints->state_standby.mode);
414c70cb 622}
7ad68e2f
DB		 623static DEVICE_ATTR(suspend_standby_mode, 0444,
624 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 625
626static ssize_t regulator_suspend_mem_state_show(struct device *dev,
627 struct device_attribute *attr, char *buf)
628{
a5766f11 629 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 630
4fca9545
DB		 631 return regulator_print_state(buf,
632 rdev->constraints->state_mem.enabled);
414c70cb 633}
7ad68e2f
DB		 634static DEVICE_ATTR(suspend_mem_state, 0444,
635 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 636
637static ssize_t regulator_suspend_disk_state_show(struct device *dev,
638 struct device_attribute *attr, char *buf)
639{
a5766f11 640 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 641
4fca9545
DB		 642 return regulator_print_state(buf,
643 rdev->constraints->state_disk.enabled);
414c70cb 644}
7ad68e2f
DB		 645static DEVICE_ATTR(suspend_disk_state, 0444,
646 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 647
648static ssize_t regulator_suspend_standby_state_show(struct device *dev,
649 struct device_attribute *attr, char *buf)
650{
a5766f11 651 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 652
4fca9545
DB		 653 return regulator_print_state(buf,
654 rdev->constraints->state_standby.enabled);
414c70cb 655}
7ad68e2f
DB		 656static DEVICE_ATTR(suspend_standby_state, 0444,
657 regulator_suspend_standby_state_show, NULL);
658
f59c8f9f
MB		 659static ssize_t regulator_bypass_show(struct device *dev,
660 struct device_attribute *attr, char *buf)
661{
662 struct regulator_dev *rdev = dev_get_drvdata(dev);
663 const char *report;
664 bool bypass;
665 int ret;
666
667 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
668
669 if (ret != 0)
670 report = "unknown";
671 else if (bypass)
672 report = "enabled";
673 else
674 report = "disabled";
675
676 return sprintf(buf, "%s\n", report);
677}
678static DEVICE_ATTR(bypass, 0444,
679 regulator_bypass_show, NULL);
bc558a60 680
414c70cb
LG		 681/* Calculate the new optimum regulator operating mode based on the new total
682 * consumer load. All locks held by caller */
8460ef38 683static int drms_uA_update(struct regulator_dev *rdev)
414c70cb
LG		 684{
685 struct regulator *sibling;
686 int current_uA = 0, output_uV, input_uV, err;
687 unsigned int mode;
688
70cfef26
KK		 689 lockdep_assert_held_once(&rdev->mutex);
690
8460ef38
BA		 691 /*
692 * first check to see if we can set modes at all, otherwise just
693 * tell the consumer everything is OK.
694 */
414c70cb 695 err = regulator_check_drms(rdev);
8460ef38
BA		 696 if (err < 0)
697 return 0;
698
8f4490e0
BA		 699 if (!rdev->desc->ops->get_optimum_mode &&
700 !rdev->desc->ops->set_load)
8460ef38
BA		 701 return 0;
702
8f4490e0
BA		 703 if (!rdev->desc->ops->set_mode &&
704 !rdev->desc->ops->set_load)
8460ef38 705 return -EINVAL;
414c70cb
LG		 706
707 /* get output voltage */
1bf5a1f8 708 output_uV = _regulator_get_voltage(rdev);
8460ef38
BA		 709 if (output_uV <= 0) {
710 rdev_err(rdev, "invalid output voltage found\n");
711 return -EINVAL;
712 }
414c70cb
LG		 713
714 /* get input voltage */
1bf5a1f8
MB		 715 input_uV = 0;
716 if (rdev->supply)
3f24f5ad 717 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 718 if (input_uV <= 0)
414c70cb 719 input_uV = rdev->constraints->input_uV;
8460ef38
BA		 720 if (input_uV <= 0) {
721 rdev_err(rdev, "invalid input voltage found\n");
722 return -EINVAL;
723 }
414c70cb
LG		 724
725 /* calc total requested load */
726 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 727 current_uA += sibling->uA_load;
414c70cb 728
22a10bca
SB		 729 current_uA += rdev->constraints->system_load;
730
8f4490e0
BA		 731 if (rdev->desc->ops->set_load) {
732 /* set the optimum mode for our new total regulator load */
733 err = rdev->desc->ops->set_load(rdev, current_uA);
734 if (err < 0)
735 rdev_err(rdev, "failed to set load %d\n", current_uA);
736 } else {
737 /* now get the optimum mode for our new total regulator load */
738 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
739 output_uV, current_uA);
740
741 /* check the new mode is allowed */
742 err = regulator_mode_constrain(rdev, &mode);
743 if (err < 0) {
744 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
745 current_uA, input_uV, output_uV);
746 return err;
747 }
414c70cb 748
8f4490e0
BA		 749 err = rdev->desc->ops->set_mode(rdev, mode);
750 if (err < 0)
751 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
8460ef38
BA		 752 }
753
8460ef38 754 return err;
414c70cb
LG		 755}
756
757static int suspend_set_state(struct regulator_dev *rdev,
758 struct regulator_state *rstate)
759{
760 int ret = 0;
638f85c5
MB		 761
762 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 763 * only warn if the driver implements set_suspend_voltage or
764 * set_suspend_mode callback.
638f85c5
MB		 765 */
766 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 767 if (rdev->desc->ops->set_suspend_voltage ||
768 rdev->desc->ops->set_suspend_mode)
5da84fd9 769 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 770 return 0;
771 }
772
773 if (rstate->enabled && rstate->disabled) {
5da84fd9 774 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 775 return -EINVAL;
776 }
414c70cb 777
8ac0e95d 778 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 779 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 780 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 781 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 782 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
783 ret = 0;
784
414c70cb 785 if (ret < 0) {
5da84fd9 786 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 787 return ret;
788 }
789
790 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
791 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
792 if (ret < 0) {
5da84fd9 793 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 794 return ret;
795 }
796 }
797
798 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
799 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
800 if (ret < 0) {
5da84fd9 801 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 802 return ret;
803 }
804 }
805 return ret;
806}
807
808/* locks held by caller */
809static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
810{
70cfef26
KK		 811 lockdep_assert_held_once(&rdev->mutex);
812
414c70cb
LG		 813 if (!rdev->constraints)
814 return -EINVAL;
815
816 switch (state) {
817 case PM_SUSPEND_STANDBY:
818 return suspend_set_state(rdev,
819 &rdev->constraints->state_standby);
820 case PM_SUSPEND_MEM:
821 return suspend_set_state(rdev,
822 &rdev->constraints->state_mem);
823 case PM_SUSPEND_MAX:
824 return suspend_set_state(rdev,
825 &rdev->constraints->state_disk);
826 default:
827 return -EINVAL;
828 }
829}
830
831static void print_constraints(struct regulator_dev *rdev)
832{
833 struct regulation_constraints *constraints = rdev->constraints;
a7068e39 834 char buf[160] = "";
5751a99f 835 size_t len = sizeof(buf) - 1;
8f031b48
MB		 836 int count = 0;
837 int ret;
414c70cb 838
8f031b48 839 if (constraints->min_uV && constraints->max_uV) {
414c70cb 840 if (constraints->min_uV == constraints->max_uV)
5751a99f
SW		 841 count += scnprintf(buf + count, len - count, "%d mV ",
842 constraints->min_uV / 1000);
414c70cb 843 else
5751a99f
SW		 844 count += scnprintf(buf + count, len - count,
845 "%d <--> %d mV ",
846 constraints->min_uV / 1000,
847 constraints->max_uV / 1000);
8f031b48
MB		 848 }
849
850 if (!constraints->min_uV ||
851 constraints->min_uV != constraints->max_uV) {
852 ret = _regulator_get_voltage(rdev);
853 if (ret > 0)
5751a99f
SW		 854 count += scnprintf(buf + count, len - count,
855 "at %d mV ", ret / 1000);
8f031b48
MB		 856 }
857
bf5892a8 858 if (constraints->uV_offset)
5751a99f
SW		 859 count += scnprintf(buf + count, len - count, "%dmV offset ",
860 constraints->uV_offset / 1000);
bf5892a8 861
8f031b48 862 if (constraints->min_uA && constraints->max_uA) {
414c70cb 863 if (constraints->min_uA == constraints->max_uA)
5751a99f
SW		 864 count += scnprintf(buf + count, len - count, "%d mA ",
865 constraints->min_uA / 1000);
414c70cb 866 else
5751a99f
SW		 867 count += scnprintf(buf + count, len - count,
868 "%d <--> %d mA ",
869 constraints->min_uA / 1000,
870 constraints->max_uA / 1000);
8f031b48
MB		 871 }
872
873 if (!constraints->min_uA ||
874 constraints->min_uA != constraints->max_uA) {
875 ret = _regulator_get_current_limit(rdev);
876 if (ret > 0)
5751a99f
SW		 877 count += scnprintf(buf + count, len - count,
878 "at %d mA ", ret / 1000);
414c70cb 879 }
8f031b48 880
414c70cb 881 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
5751a99f 882 count += scnprintf(buf + count, len - count, "fast ");
414c70cb 883 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
5751a99f 884 count += scnprintf(buf + count, len - count, "normal ");
414c70cb 885 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
5751a99f 886 count += scnprintf(buf + count, len - count, "idle ");
414c70cb 887 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
5751a99f 888 count += scnprintf(buf + count, len - count, "standby");
414c70cb 889
215b8b05 890 if (!count)
5751a99f 891 scnprintf(buf, len, "no parameters");
215b8b05 892
194dbaef 893 rdev_dbg(rdev, "%s\n", buf);
4a682922
MB		 894
895 if ((constraints->min_uV != constraints->max_uV) &&
896 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
897 rdev_warn(rdev,
898 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 899}
900
e79055d6 901static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 902 struct regulation_constraints *constraints)
a5766f11 903{
272e2315 904 const struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 905 int ret;
906
907 /* do we need to apply the constraint voltage */
908 if (rdev->constraints->apply_uV &&
75790251 909 rdev->constraints->min_uV == rdev->constraints->max_uV) {
064d5cd1
AB		 910 int current_uV = _regulator_get_voltage(rdev);
911 if (current_uV < 0) {
69d58839
NM		 912 rdev_err(rdev,
913 "failed to get the current voltage(%d)\n",
914 current_uV);
064d5cd1
AB		 915 return current_uV;
916 }
917 if (current_uV < rdev->constraints->min_uV ||
918 current_uV > rdev->constraints->max_uV) {
919 ret = _regulator_do_set_voltage(
920 rdev, rdev->constraints->min_uV,
921 rdev->constraints->max_uV);
922 if (ret < 0) {
923 rdev_err(rdev,
69d58839
NM		 924 "failed to apply %duV constraint(%d)\n",
925 rdev->constraints->min_uV, ret);
064d5cd1
AB		 926 return ret;
927 }
75790251 928 }
af5866c9 929 }
e06f5b4f 930
4367cfdc
DB		 931 /* constrain machine-level voltage specs to fit
932 * the actual range supported by this regulator.
933 */
934 if (ops->list_voltage && rdev->desc->n_voltages) {
935 int count = rdev->desc->n_voltages;
936 int i;
937 int min_uV = INT_MAX;
938 int max_uV = INT_MIN;
939 int cmin = constraints->min_uV;
940 int cmax = constraints->max_uV;
941
3e590918
MB		 942 /* it's safe to autoconfigure fixed-voltage supplies
943 and the constraints are used by list_voltage. */
4367cfdc 944 if (count == 1 && !cmin) {
3e590918 945 cmin = 1;
4367cfdc 946 cmax = INT_MAX;
3e590918
MB		 947 constraints->min_uV = cmin;
948 constraints->max_uV = cmax;
4367cfdc
DB		 949 }
950
3e2b9abd
MB		 951 /* voltage constraints are optional */
952 if ((cmin == 0) && (cmax == 0))
e79055d6 953 return 0;
3e2b9abd 954
4367cfdc 955 /* else require explicit machine-level constraints */
3e2b9abd 956 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 957 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 958 return -EINVAL;
4367cfdc
DB		 959 }
960
961 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
962 for (i = 0; i < count; i++) {
963 int value;
964
965 value = ops->list_voltage(rdev, i);
966 if (value <= 0)
967 continue;
968
969 /* maybe adjust [min_uV..max_uV] */
970 if (value >= cmin && value < min_uV)
971 min_uV = value;
972 if (value <= cmax && value > max_uV)
973 max_uV = value;
974 }
975
976 /* final: [min_uV..max_uV] valid iff constraints valid */
977 if (max_uV < min_uV) {
fff15bef
MB		 978 rdev_err(rdev,
979 "unsupportable voltage constraints %u-%uuV\n",
980 min_uV, max_uV);
e79055d6 981 return -EINVAL;
4367cfdc
DB		 982 }
983
984 /* use regulator's subset of machine constraints */
985 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 986 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
987 constraints->min_uV, min_uV);
4367cfdc
DB		 988 constraints->min_uV = min_uV;
989 }
990 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 991 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
992 constraints->max_uV, max_uV);
4367cfdc
DB		 993 constraints->max_uV = max_uV;
994 }
995 }
996
e79055d6
MB		 997 return 0;
998}
999
f8c1700d
LD		 1000static int machine_constraints_current(struct regulator_dev *rdev,
1001 struct regulation_constraints *constraints)
1002{
272e2315 1003 const struct regulator_ops *ops = rdev->desc->ops;
f8c1700d
LD		 1004 int ret;
1005
1006 if (!constraints->min_uA && !constraints->max_uA)
1007 return 0;
1008
1009 if (constraints->min_uA > constraints->max_uA) {
1010 rdev_err(rdev, "Invalid current constraints\n");
1011 return -EINVAL;
1012 }
1013
1014 if (!ops->set_current_limit || !ops->get_current_limit) {
1015 rdev_warn(rdev, "Operation of current configuration missing\n");
1016 return 0;
1017 }
1018
1019 /* Set regulator current in constraints range */
1020 ret = ops->set_current_limit(rdev, constraints->min_uA,
1021 constraints->max_uA);
1022 if (ret < 0) {
1023 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1024 return ret;
1025 }
1026
1027 return 0;
1028}
1029
30c21971
MP		 1030static int _regulator_do_enable(struct regulator_dev *rdev);
1031
e79055d6
MB		 1032/**
1033 * set_machine_constraints - sets regulator constraints
1034 * @rdev: regulator source
1035 * @constraints: constraints to apply
1036 *
1037 * Allows platform initialisation code to define and constrain
1038 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1039 * Constraints *must* be set by platform code in order for some
1040 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1041 * set_mode.
1042 */
1043static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 1044 const struct regulation_constraints *constraints)
e79055d6
MB		 1045{
1046 int ret = 0;
272e2315 1047 const struct regulator_ops *ops = rdev->desc->ops;
e79055d6 1048
9a8f5e07
MB		 1049 if (constraints)
1050 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1051 GFP_KERNEL);
1052 else
1053 rdev->constraints = kzalloc(sizeof(*constraints),
1054 GFP_KERNEL);
f8c12fe3
MB		 1055 if (!rdev->constraints)
1056 return -ENOMEM;
af5866c9 1057
f8c12fe3 1058 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 1059 if (ret != 0)
1060 goto out;
1061
f8c1700d 1062 ret = machine_constraints_current(rdev, rdev->constraints);
e79055d6
MB		 1063 if (ret != 0)
1064 goto out;
1065
36e4f839
SB		 1066 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1067 ret = ops->set_input_current_limit(rdev,
1068 rdev->constraints->ilim_uA);
1069 if (ret < 0) {
1070 rdev_err(rdev, "failed to set input limit\n");
1071 goto out;
1072 }
1073 }
1074
a5766f11 1075 /* do we need to setup our suspend state */
9a8f5e07 1076 if (rdev->constraints->initial_state) {
f8c12fe3 1077 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 1078 if (ret < 0) {
5da84fd9 1079 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 1080 goto out;
1081 }
1082 }
a5766f11 1083
9a8f5e07 1084 if (rdev->constraints->initial_mode) {
a308466c 1085 if (!ops->set_mode) {
5da84fd9 1086 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 1087 ret = -EINVAL;
1088 goto out;
1089 }
1090
f8c12fe3 1091 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 1092 if (ret < 0) {
5da84fd9 1093 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 1094 goto out;
1095 }
1096 }
1097
cacf90f2
MB		 1098 /* If the constraints say the regulator should be on at this point
1099 * and we have control then make sure it is enabled.
1100 */
30c21971
MP		 1101 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1102 ret = _regulator_do_enable(rdev);
1103 if (ret < 0 && ret != -EINVAL) {
5da84fd9 1104 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 1105 goto out;
1106 }
1107 }
1108
1653ccf4
YSB		 1109 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1110 && ops->set_ramp_delay) {
6f0b2c69
YSB		 1111 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1112 if (ret < 0) {
1113 rdev_err(rdev, "failed to set ramp_delay\n");
1114 goto out;
1115 }
1116 }
1117
23c779b9
SB		 1118 if (rdev->constraints->pull_down && ops->set_pull_down) {
1119 ret = ops->set_pull_down(rdev);
1120 if (ret < 0) {
1121 rdev_err(rdev, "failed to set pull down\n");
1122 goto out;
1123 }
1124 }
1125
57f66b78
SB		 1126 if (rdev->constraints->soft_start && ops->set_soft_start) {
1127 ret = ops->set_soft_start(rdev);
1128 if (ret < 0) {
1129 rdev_err(rdev, "failed to set soft start\n");
1130 goto out;
1131 }
1132 }
1133
3a003bae
SB		 1134 if (rdev->constraints->over_current_protection
1135 && ops->set_over_current_protection) {
1136 ret = ops->set_over_current_protection(rdev);
1137 if (ret < 0) {
1138 rdev_err(rdev, "failed to set over current protection\n");
1139 goto out;
1140 }
1141 }
1142
a5766f11 1143 print_constraints(rdev);
1a6958e7 1144 return 0;
a5766f11 1145out:
1a6958e7
AL		 1146 kfree(rdev->constraints);
1147 rdev->constraints = NULL;
a5766f11
LG		 1148 return ret;
1149}
1150
1151/**
1152 * set_supply - set regulator supply regulator
69279fb9
MB		 1153 * @rdev: regulator name
1154 * @supply_rdev: supply regulator name
a5766f11
LG		 1155 *
1156 * Called by platform initialisation code to set the supply regulator for this
1157 * regulator. This ensures that a regulators supply will also be enabled by the
1158 * core if it's child is enabled.
1159 */
1160static int set_supply(struct regulator_dev *rdev,
3801b86a 1161 struct regulator_dev *supply_rdev)
a5766f11
LG		 1162{
1163 int err;
1164
3801b86a
MB		 1165 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1166
e2c09ae7
JMC		 1167 if (!try_module_get(supply_rdev->owner))
1168 return -ENODEV;
1169
3801b86a 1170 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 1171 if (rdev->supply == NULL) {
1172 err = -ENOMEM;
3801b86a 1173 return err;
a5766f11 1174 }
57ad526a 1175 supply_rdev->open_count++;
3801b86a
MB		 1176
1177 return 0;
a5766f11
LG		 1178}
1179
1180/**
06c63f93 1181 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 1182 * @rdev: regulator source
40f9244f 1183 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 1184 * @supply: symbolic name for supply
a5766f11
LG		 1185 *
1186 * Allows platform initialisation code to map physical regulator
1187 * sources to symbolic names for supplies for use by devices. Devices
1188 * should use these symbolic names to request regulators, avoiding the
1189 * need to provide board-specific regulator names as platform data.
1190 */
1191static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 1192 const char *consumer_dev_name,
1193 const char *supply)
a5766f11
LG		 1194{
1195 struct regulator_map *node;
9ed2099e 1196 int has_dev;
a5766f11
LG		 1197
1198 if (supply == NULL)
1199 return -EINVAL;
1200
9ed2099e
MB		 1201 if (consumer_dev_name != NULL)
1202 has_dev = 1;
1203 else
1204 has_dev = 0;
1205
6001e13c 1206 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1207 if (node->dev_name && consumer_dev_name) {
1208 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1209 continue;
1210 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1211 continue;
23b5cc2a
JN		 1212 }
1213
6001e13c
DB		 1214 if (strcmp(node->supply, supply) != 0)
1215 continue;
1216
737f360d
MB		 1217 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1218 consumer_dev_name,
1219 dev_name(&node->regulator->dev),
1220 node->regulator->desc->name,
1221 supply,
1222 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1223 return -EBUSY;
1224 }
1225
9ed2099e 1226 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1227 if (node == NULL)
1228 return -ENOMEM;
1229
1230 node->regulator = rdev;
a5766f11
LG		 1231 node->supply = supply;
1232
9ed2099e
MB		 1233 if (has_dev) {
1234 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1235 if (node->dev_name == NULL) {
1236 kfree(node);
1237 return -ENOMEM;
1238 }
40f9244f
MB		 1239 }
1240
a5766f11
LG		 1241 list_add(&node->list, &regulator_map_list);
1242 return 0;
1243}
1244
0f1d747b
MR		 1245static void unset_regulator_supplies(struct regulator_dev *rdev)
1246{
1247 struct regulator_map *node, *n;
1248
1249 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1250 if (rdev == node->regulator) {
1251 list_del(&node->list);
40f9244f 1252 kfree(node->dev_name);
0f1d747b 1253 kfree(node);
0f1d747b
MR		 1254 }
1255 }
1256}
1257
f5726ae3 1258#define REG_STR_SIZE 64
414c70cb
LG		 1259
1260static struct regulator *create_regulator(struct regulator_dev *rdev,
1261 struct device *dev,
1262 const char *supply_name)
1263{
1264 struct regulator *regulator;
1265 char buf[REG_STR_SIZE];
1266 int err, size;
1267
1268 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1269 if (regulator == NULL)
1270 return NULL;
1271
1272 mutex_lock(&rdev->mutex);
1273 regulator->rdev = rdev;
1274 list_add(&regulator->list, &rdev->consumer_list);
1275
1276 if (dev) {
e2c98eaf
SG		 1277 regulator->dev = dev;
1278
222cc7b1 1279 /* Add a link to the device sysfs entry */
414c70cb
LG		 1280 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1281 dev->kobj.name, supply_name);
1282 if (size >= REG_STR_SIZE)
222cc7b1 1283 goto overflow_err;
414c70cb
LG		 1284
1285 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1286 if (regulator->supply_name == NULL)
222cc7b1 1287 goto overflow_err;
414c70cb 1288
ff268b56 1289 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
414c70cb
LG		 1290 buf);
1291 if (err) {
ff268b56 1292 rdev_dbg(rdev, "could not add device link %s err %d\n",
5da84fd9 1293 dev->kobj.name, err);
222cc7b1 1294 /* non-fatal */
414c70cb 1295 }
5de70519
MB		 1296 } else {
1297 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1298 if (regulator->supply_name == NULL)
222cc7b1 1299 goto overflow_err;
5de70519
MB		 1300 }
1301
5de70519
MB		 1302 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1303 rdev->debugfs);
24751434 1304 if (!regulator->debugfs) {
ad3a942b 1305 rdev_dbg(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1306 } else {
1307 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1308 &regulator->uA_load);
1309 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1310 &regulator->min_uV);
1311 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1312 &regulator->max_uV);
414c70cb 1313 }
5de70519 1314
6492bc1b
MB		 1315 /*
1316 * Check now if the regulator is an always on regulator - if
1317 * it is then we don't need to do nearly so much work for
1318 * enable/disable calls.
1319 */
1320 if (!_regulator_can_change_status(rdev) &&
1321 _regulator_is_enabled(rdev))
1322 regulator->always_on = true;
1323
414c70cb
LG		 1324 mutex_unlock(&rdev->mutex);
1325 return regulator;
414c70cb
LG		 1326overflow_err:
1327 list_del(&regulator->list);
1328 kfree(regulator);
1329 mutex_unlock(&rdev->mutex);
1330 return NULL;
1331}
1332
31aae2be
MB		 1333static int _regulator_get_enable_time(struct regulator_dev *rdev)
1334{
00c877c6
LD		 1335 if (rdev->constraints && rdev->constraints->enable_time)
1336 return rdev->constraints->enable_time;
31aae2be 1337 if (!rdev->desc->ops->enable_time)
79511ed3 1338 return rdev->desc->enable_time;
31aae2be
MB		 1339 return rdev->desc->ops->enable_time(rdev);
1340}
1341
a06ccd9c
CK		 1342static struct regulator_supply_alias *regulator_find_supply_alias(
1343 struct device *dev, const char *supply)
1344{
1345 struct regulator_supply_alias *map;
1346
1347 list_for_each_entry(map, &regulator_supply_alias_list, list)
1348 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1349 return map;
1350
1351 return NULL;
1352}
1353
1354static void regulator_supply_alias(struct device **dev, const char **supply)
1355{
1356 struct regulator_supply_alias *map;
1357
1358 map = regulator_find_supply_alias(*dev, *supply);
1359 if (map) {
1360 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1361 *supply, map->alias_supply,
1362 dev_name(map->alias_dev));
1363 *dev = map->alias_dev;
1364 *supply = map->alias_supply;
1365 }
1366}
1367
85f3b431
TV		 1368static int of_node_match(struct device *dev, const void *data)
1369{
1370 return dev->of_node == data;
1371}
1372
1373static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1374{
1375 struct device *dev;
1376
1377 dev = class_find_device(&regulator_class, NULL, np, of_node_match);
1378
1379 return dev ? dev_to_rdev(dev) : NULL;
1380}
1381
1382static int regulator_match(struct device *dev, const void *data)
1383{
1384 struct regulator_dev *r = dev_to_rdev(dev);
1385
1386 return strcmp(rdev_get_name(r), data) == 0;
1387}
1388
1389static struct regulator_dev *regulator_lookup_by_name(const char *name)
1390{
1391 struct device *dev;
1392
1393 dev = class_find_device(&regulator_class, NULL, name, regulator_match);
1394
1395 return dev ? dev_to_rdev(dev) : NULL;
1396}
1397
1398/**
1399 * regulator_dev_lookup - lookup a regulator device.
1400 * @dev: device for regulator "consumer".
1401 * @supply: Supply name or regulator ID.
1402 * @ret: 0 on success, -ENODEV if lookup fails permanently, -EPROBE_DEFER if
1403 * lookup could succeed in the future.
1404 *
1405 * If successful, returns a struct regulator_dev that corresponds to the name
1406 * @supply and with the embedded struct device refcount incremented by one,
1407 * or NULL on failure. The refcount must be dropped by calling put_device().
1408 */
69511a45 1409static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1410 const char *supply,
1411 int *ret)
69511a45
RN		 1412{
1413 struct regulator_dev *r;
1414 struct device_node *node;
576ca436
MB		 1415 struct regulator_map *map;
1416 const char *devname = NULL;
69511a45 1417
a06ccd9c
CK		 1418 regulator_supply_alias(&dev, &supply);
1419
69511a45
RN		 1420 /* first do a dt based lookup */
1421 if (dev && dev->of_node) {
1422 node = of_get_regulator(dev, supply);
6d191a5f 1423 if (node) {
85f3b431
TV		 1424 r = of_find_regulator_by_node(node);
1425 if (r)
1426 return r;
317b5684
MB		 1427 *ret = -EPROBE_DEFER;
1428 return NULL;
6d191a5f
MB		 1429 } else {
1430 /*
1431 * If we couldn't even get the node then it's
1432 * not just that the device didn't register
1433 * yet, there's no node and we'll never
1434 * succeed.
1435 */
1436 *ret = -ENODEV;
1437 }
69511a45
RN		 1438 }
1439
1440 /* if not found, try doing it non-dt way */
576ca436
MB		 1441 if (dev)
1442 devname = dev_name(dev);
1443
85f3b431
TV		 1444 r = regulator_lookup_by_name(supply);
1445 if (r)
1446 return r;
69511a45 1447
85f3b431 1448 mutex_lock(&regulator_list_mutex);
576ca436
MB		 1449 list_for_each_entry(map, &regulator_map_list, list) {
1450 /* If the mapping has a device set up it must match */
1451 if (map->dev_name &&
1452 (!devname || strcmp(map->dev_name, devname)))
1453 continue;
1454
85f3b431
TV		 1455 if (strcmp(map->supply, supply) == 0 &&
1456 get_device(&map->regulator->dev)) {
1457 mutex_unlock(&regulator_list_mutex);
576ca436 1458 return map->regulator;
85f3b431 1459 }
576ca436 1460 }
85f3b431 1461 mutex_unlock(&regulator_list_mutex);
576ca436 1462
69511a45
RN		 1463 return NULL;
1464}
1465
6261b06d
BA		 1466static int regulator_resolve_supply(struct regulator_dev *rdev)
1467{
1468 struct regulator_dev *r;
1469 struct device *dev = rdev->dev.parent;
1470 int ret;
1471
1472 /* No supply to resovle? */
1473 if (!rdev->supply_name)
1474 return 0;
1475
1476 /* Supply already resolved? */
1477 if (rdev->supply)
1478 return 0;
1479
1480 r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
6261b06d 1481 if (!r) {
23c3f310
CK		 1482 if (ret == -ENODEV) {
1483 /*
1484 * No supply was specified for this regulator and
1485 * there will never be one.
1486 */
1487 return 0;
1488 }
1489
06423121
MB		 1490 /* Did the lookup explicitly defer for us? */
1491 if (ret == -EPROBE_DEFER)
1492 return ret;
1493
9f7e25ed
MB		 1494 if (have_full_constraints()) {
1495 r = dummy_regulator_rdev;
85f3b431 1496 get_device(&r->dev);
9f7e25ed
MB		 1497 } else {
1498 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1499 rdev->supply_name, rdev->desc->name);
1500 return -EPROBE_DEFER;
1501 }
6261b06d
BA		 1502 }
1503
1504 /* Recursively resolve the supply of the supply */
1505 ret = regulator_resolve_supply(r);
85f3b431
TV		 1506 if (ret < 0) {
1507 put_device(&r->dev);
6261b06d 1508 return ret;
85f3b431 1509 }
6261b06d
BA		 1510
1511 ret = set_supply(rdev, r);
85f3b431
TV		 1512 if (ret < 0) {
1513 put_device(&r->dev);
6261b06d 1514 return ret;
85f3b431 1515 }
6261b06d
BA		 1516
1517 /* Cascade always-on state to supply */
9f8df6ad 1518 if (_regulator_is_enabled(rdev) && rdev->supply) {
6261b06d 1519 ret = regulator_enable(rdev->supply);
36a1f1b6 1520 if (ret < 0) {
9f8df6ad 1521 _regulator_put(rdev->supply);
6261b06d 1522 return ret;
36a1f1b6 1523 }
6261b06d
BA		 1524 }
1525
1526 return 0;
1527}
1528
5ffbd136
MB		 1529/* Internal regulator request function */
1530static struct regulator *_regulator_get(struct device *dev, const char *id,
4ddfebd3 1531 bool exclusive, bool allow_dummy)
414c70cb
LG		 1532{
1533 struct regulator_dev *rdev;
04bf3011 1534 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1535 const char *devname = NULL;
317b5684 1536 int ret;
414c70cb
LG		 1537
1538 if (id == NULL) {
5da84fd9 1539 pr_err("get() with no identifier\n");
043c998f 1540 return ERR_PTR(-EINVAL);
414c70cb
LG		 1541 }
1542
40f9244f
MB		 1543 if (dev)
1544 devname = dev_name(dev);
1545
317b5684
MB		 1546 if (have_full_constraints())
1547 ret = -ENODEV;
1548 else
1549 ret = -EPROBE_DEFER;
1550
6d191a5f 1551 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1552 if (rdev)
1553 goto found;
1554
ef60abbb
MB		 1555 regulator = ERR_PTR(ret);
1556
1e4b545c
NM		 1557 /*
1558 * If we have return value from dev_lookup fail, we do not expect to
1559 * succeed, so, quit with appropriate error value
1560 */
0d25d09d 1561 if (ret && ret != -ENODEV)
85f3b431 1562 return regulator;
1e4b545c 1563
34abbd68
MB		 1564 if (!devname)
1565 devname = "deviceless";
1566
4ddfebd3
MB		 1567 /*
1568 * Assume that a regulator is physically present and enabled
1569 * even if it isn't hooked up and just provide a dummy.
34abbd68 1570 */
87b28417 1571 if (have_full_constraints() && allow_dummy) {
5da84fd9
JP		 1572 pr_warn("%s supply %s not found, using dummy regulator\n",
1573 devname, id);
4ddfebd3 1574
34abbd68 1575 rdev = dummy_regulator_rdev;
85f3b431 1576 get_device(&rdev->dev);
34abbd68 1577 goto found;
0781719b
HG		 1578 /* Don't log an error when called from regulator_get_optional() */
1579 } else if (!have_full_constraints() || exclusive) {
acc3d5ce 1580 dev_warn(dev, "dummy supplies not allowed\n");
34abbd68 1581 }
34abbd68 1582
414c70cb
LG		 1583 return regulator;
1584
1585found:
5ffbd136
MB		 1586 if (rdev->exclusive) {
1587 regulator = ERR_PTR(-EPERM);
85f3b431
TV		 1588 put_device(&rdev->dev);
1589 return regulator;
5ffbd136
MB		 1590 }
1591
1592 if (exclusive && rdev->open_count) {
1593 regulator = ERR_PTR(-EBUSY);
85f3b431
TV		 1594 put_device(&rdev->dev);
1595 return regulator;
5ffbd136
MB		 1596 }
1597
6261b06d
BA		 1598 ret = regulator_resolve_supply(rdev);
1599 if (ret < 0) {
1600 regulator = ERR_PTR(ret);
85f3b431
TV		 1601 put_device(&rdev->dev);
1602 return regulator;
6261b06d
BA		 1603 }
1604
85f3b431
TV		 1605 if (!try_module_get(rdev->owner)) {
1606 put_device(&rdev->dev);
1607 return regulator;
1608 }
a5766f11 1609
414c70cb
LG		 1610 regulator = create_regulator(rdev, dev, id);
1611 if (regulator == NULL) {
1612 regulator = ERR_PTR(-ENOMEM);
85f3b431 1613 put_device(&rdev->dev);
414c70cb 1614 module_put(rdev->owner);
85f3b431 1615 return regulator;
414c70cb
LG		 1616 }
1617
5ffbd136
MB		 1618 rdev->open_count++;
1619 if (exclusive) {
1620 rdev->exclusive = 1;
1621
1622 ret = _regulator_is_enabled(rdev);
1623 if (ret > 0)
1624 rdev->use_count = 1;
1625 else
1626 rdev->use_count = 0;
1627 }
1628
414c70cb
LG		 1629 return regulator;
1630}
5ffbd136
MB		 1631
1632/**
1633 * regulator_get - lookup and obtain a reference to a regulator.
1634 * @dev: device for regulator "consumer"
1635 * @id: Supply name or regulator ID.
1636 *
1637 * Returns a struct regulator corresponding to the regulator producer,
1638 * or IS_ERR() condition containing errno.
1639 *
1640 * Use of supply names configured via regulator_set_device_supply() is
1641 * strongly encouraged. It is recommended that the supply name used
1642 * should match the name used for the supply and/or the relevant
1643 * device pins in the datasheet.
1644 */
1645struct regulator *regulator_get(struct device *dev, const char *id)
1646{
4ddfebd3 1647 return _regulator_get(dev, id, false, true);
5ffbd136 1648}
414c70cb
LG		 1649EXPORT_SYMBOL_GPL(regulator_get);
1650
5ffbd136
MB		 1651/**
1652 * regulator_get_exclusive - obtain exclusive access to a regulator.
1653 * @dev: device for regulator "consumer"
1654 * @id: Supply name or regulator ID.
1655 *
1656 * Returns a struct regulator corresponding to the regulator producer,
1657 * or IS_ERR() condition containing errno. Other consumers will be
69c3f723
SB		 1658 * unable to obtain this regulator while this reference is held and the
1659 * use count for the regulator will be initialised to reflect the current
1660 * state of the regulator.
5ffbd136
MB		 1661 *
1662 * This is intended for use by consumers which cannot tolerate shared
1663 * use of the regulator such as those which need to force the
1664 * regulator off for correct operation of the hardware they are
1665 * controlling.
1666 *
1667 * Use of supply names configured via regulator_set_device_supply() is
1668 * strongly encouraged. It is recommended that the supply name used
1669 * should match the name used for the supply and/or the relevant
1670 * device pins in the datasheet.
1671 */
1672struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1673{
4ddfebd3 1674 return _regulator_get(dev, id, true, false);
5ffbd136
MB		 1675}
1676EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1677
de1dd9fd
MB		 1678/**
1679 * regulator_get_optional - obtain optional access to a regulator.
1680 * @dev: device for regulator "consumer"
1681 * @id: Supply name or regulator ID.
1682 *
1683 * Returns a struct regulator corresponding to the regulator producer,
69c3f723 1684 * or IS_ERR() condition containing errno.
de1dd9fd
MB		 1685 *
1686 * This is intended for use by consumers for devices which can have
1687 * some supplies unconnected in normal use, such as some MMC devices.
1688 * It can allow the regulator core to provide stub supplies for other
1689 * supplies requested using normal regulator_get() calls without
1690 * disrupting the operation of drivers that can handle absent
1691 * supplies.
1692 *
1693 * Use of supply names configured via regulator_set_device_supply() is
1694 * strongly encouraged. It is recommended that the supply name used
1695 * should match the name used for the supply and/or the relevant
1696 * device pins in the datasheet.
1697 */
1698struct regulator *regulator_get_optional(struct device *dev, const char *id)
1699{
4ddfebd3 1700 return _regulator_get(dev, id, false, false);
de1dd9fd
MB		 1701}
1702EXPORT_SYMBOL_GPL(regulator_get_optional);
1703
83b0302d 1704/* regulator_list_mutex lock held by regulator_put() */
23ff2f0f 1705static void _regulator_put(struct regulator *regulator)
414c70cb
LG		 1706{
1707 struct regulator_dev *rdev;
1708
93576842 1709 if (IS_ERR_OR_NULL(regulator))
414c70cb
LG		 1710 return;
1711
70cfef26
KK		 1712 lockdep_assert_held_once(&regulator_list_mutex);
1713
414c70cb
LG		 1714 rdev = regulator->rdev;
1715
5de70519 1716 debugfs_remove_recursive(regulator->debugfs);
5de70519 1717
414c70cb 1718 /* remove any sysfs entries */
e2c98eaf 1719 if (regulator->dev)
414c70cb 1720 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
83b0302d 1721 mutex_lock(&rdev->mutex);
414c70cb 1722 list_del(&regulator->list);
414c70cb 1723
5ffbd136
MB		 1724 rdev->open_count--;
1725 rdev->exclusive = 0;
85f3b431 1726 put_device(&rdev->dev);
83b0302d 1727 mutex_unlock(&rdev->mutex);
5ffbd136 1728
1768514e
MB		 1729 kfree(regulator->supply_name);
1730 kfree(regulator);
1731
414c70cb 1732 module_put(rdev->owner);
23ff2f0f
CK		 1733}
1734
1735/**
1736 * regulator_put - "free" the regulator source
1737 * @regulator: regulator source
1738 *
1739 * Note: drivers must ensure that all regulator_enable calls made on this
1740 * regulator source are balanced by regulator_disable calls prior to calling
1741 * this function.
1742 */
1743void regulator_put(struct regulator *regulator)
1744{
1745 mutex_lock(&regulator_list_mutex);
1746 _regulator_put(regulator);
414c70cb
LG		 1747 mutex_unlock(&regulator_list_mutex);
1748}
1749EXPORT_SYMBOL_GPL(regulator_put);
1750
a06ccd9c
CK		 1751/**
1752 * regulator_register_supply_alias - Provide device alias for supply lookup
1753 *
1754 * @dev: device that will be given as the regulator "consumer"
1755 * @id: Supply name or regulator ID
1756 * @alias_dev: device that should be used to lookup the supply
1757 * @alias_id: Supply name or regulator ID that should be used to lookup the
1758 * supply
1759 *
1760 * All lookups for id on dev will instead be conducted for alias_id on
1761 * alias_dev.
1762 */
1763int regulator_register_supply_alias(struct device *dev, const char *id,
1764 struct device *alias_dev,
1765 const char *alias_id)
1766{
1767 struct regulator_supply_alias *map;
1768
1769 map = regulator_find_supply_alias(dev, id);
1770 if (map)
1771 return -EEXIST;
1772
1773 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1774 if (!map)
1775 return -ENOMEM;
1776
1777 map->src_dev = dev;
1778 map->src_supply = id;
1779 map->alias_dev = alias_dev;
1780 map->alias_supply = alias_id;
1781
1782 list_add(&map->list, &regulator_supply_alias_list);
1783
1784 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1785 id, dev_name(dev), alias_id, dev_name(alias_dev));
1786
1787 return 0;
1788}
1789EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1790
1791/**
1792 * regulator_unregister_supply_alias - Remove device alias
1793 *
1794 * @dev: device that will be given as the regulator "consumer"
1795 * @id: Supply name or regulator ID
1796 *
1797 * Remove a lookup alias if one exists for id on dev.
1798 */
1799void regulator_unregister_supply_alias(struct device *dev, const char *id)
1800{
1801 struct regulator_supply_alias *map;
1802
1803 map = regulator_find_supply_alias(dev, id);
1804 if (map) {
1805 list_del(&map->list);
1806 kfree(map);
1807 }
1808}
1809EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1810
1811/**
1812 * regulator_bulk_register_supply_alias - register multiple aliases
1813 *
1814 * @dev: device that will be given as the regulator "consumer"
1815 * @id: List of supply names or regulator IDs
1816 * @alias_dev: device that should be used to lookup the supply
1817 * @alias_id: List of supply names or regulator IDs that should be used to
1818 * lookup the supply
1819 * @num_id: Number of aliases to register
1820 *
1821 * @return 0 on success, an errno on failure.
1822 *
1823 * This helper function allows drivers to register several supply
1824 * aliases in one operation. If any of the aliases cannot be
1825 * registered any aliases that were registered will be removed
1826 * before returning to the caller.
1827 */
9f8c0fe9
LJ		 1828int regulator_bulk_register_supply_alias(struct device *dev,
1829 const char *const *id,
a06ccd9c 1830 struct device *alias_dev,
9f8c0fe9 1831 const char *const *alias_id,
a06ccd9c
CK		 1832 int num_id)
1833{
1834 int i;
1835 int ret;
1836
1837 for (i = 0; i < num_id; ++i) {
1838 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1839 alias_id[i]);
1840 if (ret < 0)
1841 goto err;
1842 }
1843
1844 return 0;
1845
1846err:
1847 dev_err(dev,
1848 "Failed to create supply alias %s,%s -> %s,%s\n",
1849 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1850
1851 while (--i >= 0)
1852 regulator_unregister_supply_alias(dev, id[i]);
1853
1854 return ret;
1855}
1856EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1857
1858/**
1859 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1860 *
1861 * @dev: device that will be given as the regulator "consumer"
1862 * @id: List of supply names or regulator IDs
1863 * @num_id: Number of aliases to unregister
1864 *
1865 * This helper function allows drivers to unregister several supply
1866 * aliases in one operation.
1867 */
1868void regulator_bulk_unregister_supply_alias(struct device *dev,
9f8c0fe9 1869 const char *const *id,
a06ccd9c
CK		 1870 int num_id)
1871{
1872 int i;
1873
1874 for (i = 0; i < num_id; ++i)
1875 regulator_unregister_supply_alias(dev, id[i]);
1876}
1877EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1878
1879
f19b00da
KM		 1880/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1881static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1882 const struct regulator_config *config)
1883{
1884 struct regulator_enable_gpio *pin;
778b28b4 1885 struct gpio_desc *gpiod;
f19b00da
KM		 1886 int ret;
1887
778b28b4
RK		 1888 gpiod = gpio_to_desc(config->ena_gpio);
1889
f19b00da 1890 list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
778b28b4 1891 if (pin->gpiod == gpiod) {
f19b00da
KM		 1892 rdev_dbg(rdev, "GPIO %d is already used\n",
1893 config->ena_gpio);
1894 goto update_ena_gpio_to_rdev;
1895 }
1896 }
1897
1898 ret = gpio_request_one(config->ena_gpio,
1899 GPIOF_DIR_OUT | config->ena_gpio_flags,
1900 rdev_get_name(rdev));
1901 if (ret)
1902 return ret;
1903
1904 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1905 if (pin == NULL) {
1906 gpio_free(config->ena_gpio);
1907 return -ENOMEM;
1908 }
1909
778b28b4 1910 pin->gpiod = gpiod;
f19b00da
KM		 1911 pin->ena_gpio_invert = config->ena_gpio_invert;
1912 list_add(&pin->list, &regulator_ena_gpio_list);
1913
1914update_ena_gpio_to_rdev:
1915 pin->request_count++;
1916 rdev->ena_pin = pin;
1917 return 0;
1918}
1919
1920static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1921{
1922 struct regulator_enable_gpio *pin, *n;
1923
1924 if (!rdev->ena_pin)
1925 return;
1926
1927 /* Free the GPIO only in case of no use */
1928 list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
778b28b4 1929 if (pin->gpiod == rdev->ena_pin->gpiod) {
f19b00da
KM		 1930 if (pin->request_count <= 1) {
1931 pin->request_count = 0;
778b28b4 1932 gpiod_put(pin->gpiod);
f19b00da
KM		 1933 list_del(&pin->list);
1934 kfree(pin);
60a2362f
SWK		 1935 rdev->ena_pin = NULL;
1936 return;
f19b00da
KM		 1937 } else {
1938 pin->request_count--;
1939 }
1940 }
1941 }
1942}
1943
967cfb18 1944/**
31d6eebf
RD		 1945 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1946 * @rdev: regulator_dev structure
1947 * @enable: enable GPIO at initial use?
1948 *
967cfb18
KM		 1949 * GPIO is enabled in case of initial use. (enable_count is 0)
1950 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1951 */
1952static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1953{
1954 struct regulator_enable_gpio *pin = rdev->ena_pin;
1955
1956 if (!pin)
1957 return -EINVAL;
1958
1959 if (enable) {
1960 /* Enable GPIO at initial use */
1961 if (pin->enable_count == 0)
778b28b4
RK		 1962 gpiod_set_value_cansleep(pin->gpiod,
1963 !pin->ena_gpio_invert);
967cfb18
KM		 1964
1965 pin->enable_count++;
1966 } else {
1967 if (pin->enable_count > 1) {
1968 pin->enable_count--;
1969 return 0;
1970 }
1971
1972 /* Disable GPIO if not used */
1973 if (pin->enable_count <= 1) {
778b28b4
RK		 1974 gpiod_set_value_cansleep(pin->gpiod,
1975 pin->ena_gpio_invert);
967cfb18
KM		 1976 pin->enable_count = 0;
1977 }
1978 }
1979
1980 return 0;
1981}
1982
79fd1141
GX		 1983/**
1984 * _regulator_enable_delay - a delay helper function
1985 * @delay: time to delay in microseconds
1986 *
1987 * Delay for the requested amount of time as per the guidelines in:
1988 *
1989 * Documentation/timers/timers-howto.txt
1990 *
1991 * The assumption here is that regulators will never be enabled in
1992 * atomic context and therefore sleeping functions can be used.
1993 */
1994static void _regulator_enable_delay(unsigned int delay)
1995{
1996 unsigned int ms = delay / 1000;
1997 unsigned int us = delay % 1000;
1998
1999 if (ms > 0) {
2000 /*
2001 * For small enough values, handle super-millisecond
2002 * delays in the usleep_range() call below.
2003 */
2004 if (ms < 20)
2005 us += ms * 1000;
2006 else
2007 msleep(ms);
2008 }
2009
2010 /*
2011 * Give the scheduler some room to coalesce with any other
2012 * wakeup sources. For delays shorter than 10 us, don't even
2013 * bother setting up high-resolution timers and just busy-
2014 * loop.
2015 */
2016 if (us >= 10)
2017 usleep_range(us, us + 100);
2018 else
2019 udelay(us);
2020}
2021
5c5659d0
MB		 2022static int _regulator_do_enable(struct regulator_dev *rdev)
2023{
2024 int ret, delay;
2025
2026 /* Query before enabling in case configuration dependent. */
2027 ret = _regulator_get_enable_time(rdev);
2028 if (ret >= 0) {
2029 delay = ret;
2030 } else {
2031 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2032 delay = 0;
2033 }
2034
2035 trace_regulator_enable(rdev_get_name(rdev));
2036
871f5650
GX		 2037 if (rdev->desc->off_on_delay) {
2038 /* if needed, keep a distance of off_on_delay from last time
2039 * this regulator was disabled.
2040 */
2041 unsigned long start_jiffy = jiffies;
2042 unsigned long intended, max_delay, remaining;
2043
2044 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2045 intended = rdev->last_off_jiffy + max_delay;
2046
2047 if (time_before(start_jiffy, intended)) {
2048 /* calc remaining jiffies to deal with one-time
2049 * timer wrapping.
2050 * in case of multiple timer wrapping, either it can be
2051 * detected by out-of-range remaining, or it cannot be
2052 * detected and we gets a panelty of
2053 * _regulator_enable_delay().
2054 */
2055 remaining = intended - start_jiffy;
2056 if (remaining <= max_delay)
2057 _regulator_enable_delay(
2058 jiffies_to_usecs(remaining));
2059 }
2060 }
2061
967cfb18 2062 if (rdev->ena_pin) {
29d62ec5
DA		 2063 if (!rdev->ena_gpio_state) {
2064 ret = regulator_ena_gpio_ctrl(rdev, true);
2065 if (ret < 0)
2066 return ret;
2067 rdev->ena_gpio_state = 1;
2068 }
65f73508 2069 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 2070 ret = rdev->desc->ops->enable(rdev);
2071 if (ret < 0)
2072 return ret;
2073 } else {
2074 return -EINVAL;
2075 }
2076
2077 /* Allow the regulator to ramp; it would be useful to extend
2078 * this for bulk operations so that the regulators can ramp
2079 * together. */
2080 trace_regulator_enable_delay(rdev_get_name(rdev));
2081
79fd1141 2082 _regulator_enable_delay(delay);
5c5659d0
MB		 2083
2084 trace_regulator_enable_complete(rdev_get_name(rdev));
2085
2086 return 0;
2087}
2088
414c70cb
LG		 2089/* locks held by regulator_enable() */
2090static int _regulator_enable(struct regulator_dev *rdev)
2091{
5c5659d0 2092 int ret;
414c70cb 2093
70cfef26
KK		 2094 lockdep_assert_held_once(&rdev->mutex);
2095
414c70cb 2096 /* check voltage and requested load before enabling */
9a2372fa
MB		 2097 if (rdev->constraints &&
2098 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
2099 drms_uA_update(rdev);
414c70cb 2100
9a2372fa
MB		 2101 if (rdev->use_count == 0) {
2102 /* The regulator may on if it's not switchable or left on */
2103 ret = _regulator_is_enabled(rdev);
2104 if (ret == -EINVAL || ret == 0) {
2105 if (!_regulator_can_change_status(rdev))
2106 return -EPERM;
2107
5c5659d0 2108 ret = _regulator_do_enable(rdev);
31aae2be
MB		 2109 if (ret < 0)
2110 return ret;
2111
a7433cff 2112 } else if (ret < 0) {
5da84fd9 2113 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 2114 return ret;
2115 }
a7433cff 2116 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 2117 }
2118
9a2372fa
MB		 2119 rdev->use_count++;
2120
2121 return 0;
414c70cb
LG		 2122}
2123
2124/**
2125 * regulator_enable - enable regulator output
2126 * @regulator: regulator source
2127 *
cf7bbcdf
MB		 2128 * Request that the regulator be enabled with the regulator output at
2129 * the predefined voltage or current value. Calls to regulator_enable()
2130 * must be balanced with calls to regulator_disable().
2131 *
414c70cb 2132 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 2133 * hardwired in the regulator.
414c70cb
LG		 2134 */
2135int regulator_enable(struct regulator *regulator)
2136{
412aec61
DB		 2137 struct regulator_dev *rdev = regulator->rdev;
2138 int ret = 0;
414c70cb 2139
6492bc1b
MB		 2140 if (regulator->always_on)
2141 return 0;
2142
3801b86a
MB		 2143 if (rdev->supply) {
2144 ret = regulator_enable(rdev->supply);
2145 if (ret != 0)
2146 return ret;
2147 }
2148
412aec61 2149 mutex_lock(&rdev->mutex);
cd94b505 2150 ret = _regulator_enable(rdev);
412aec61 2151 mutex_unlock(&rdev->mutex);
3801b86a 2152
d1685e4e 2153 if (ret != 0 && rdev->supply)
3801b86a
MB		 2154 regulator_disable(rdev->supply);
2155
414c70cb
LG		 2156 return ret;
2157}
2158EXPORT_SYMBOL_GPL(regulator_enable);
2159
5c5659d0
MB		 2160static int _regulator_do_disable(struct regulator_dev *rdev)
2161{
2162 int ret;
2163
2164 trace_regulator_disable(rdev_get_name(rdev));
2165
967cfb18 2166 if (rdev->ena_pin) {
29d62ec5
DA		 2167 if (rdev->ena_gpio_state) {
2168 ret = regulator_ena_gpio_ctrl(rdev, false);
2169 if (ret < 0)
2170 return ret;
2171 rdev->ena_gpio_state = 0;
2172 }
5c5659d0
MB		 2173
2174 } else if (rdev->desc->ops->disable) {
2175 ret = rdev->desc->ops->disable(rdev);
2176 if (ret != 0)
2177 return ret;
2178 }
2179
871f5650
GX		 2180 /* cares about last_off_jiffy only if off_on_delay is required by
2181 * device.
2182 */
2183 if (rdev->desc->off_on_delay)
2184 rdev->last_off_jiffy = jiffies;
2185
5c5659d0
MB		 2186 trace_regulator_disable_complete(rdev_get_name(rdev));
2187
5c5659d0
MB		 2188 return 0;
2189}
2190
414c70cb 2191/* locks held by regulator_disable() */
3801b86a 2192static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 2193{
2194 int ret = 0;
2195
70cfef26
KK		 2196 lockdep_assert_held_once(&rdev->mutex);
2197
cd94b505 2198 if (WARN(rdev->use_count <= 0,
43e7ee33 2199 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 2200 return -EIO;
2201
414c70cb 2202 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 2203 if (rdev->use_count == 1 &&
2204 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 2205
2206 /* we are last user */
5c5659d0 2207 if (_regulator_can_change_status(rdev)) {
a1c8a551
RF		 2208 ret = _notifier_call_chain(rdev,
2209 REGULATOR_EVENT_PRE_DISABLE,
2210 NULL);
2211 if (ret & NOTIFY_STOP_MASK)
2212 return -EINVAL;
2213
5c5659d0 2214 ret = _regulator_do_disable(rdev);
414c70cb 2215 if (ret < 0) {
5da84fd9 2216 rdev_err(rdev, "failed to disable\n");
a1c8a551
RF		 2217 _notifier_call_chain(rdev,
2218 REGULATOR_EVENT_ABORT_DISABLE,
2219 NULL);
414c70cb
LG		 2220 return ret;
2221 }
66fda75f
MP		 2222 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2223 NULL);
414c70cb
LG		 2224 }
2225
414c70cb
LG		 2226 rdev->use_count = 0;
2227 } else if (rdev->use_count > 1) {
2228
2229 if (rdev->constraints &&
2230 (rdev->constraints->valid_ops_mask &
2231 REGULATOR_CHANGE_DRMS))
2232 drms_uA_update(rdev);
2233
2234 rdev->use_count--;
2235 }
3801b86a 2236
414c70cb
LG		 2237 return ret;
2238}
2239
2240/**
2241 * regulator_disable - disable regulator output
2242 * @regulator: regulator source
2243 *
cf7bbcdf
MB		 2244 * Disable the regulator output voltage or current. Calls to
2245 * regulator_enable() must be balanced with calls to
2246 * regulator_disable().
69279fb9 2247 *
414c70cb 2248 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 2249 * devices have it enabled, the regulator device supports disabling and
2250 * machine constraints permit this operation.
414c70cb
LG		 2251 */
2252int regulator_disable(struct regulator *regulator)
2253{
412aec61
DB		 2254 struct regulator_dev *rdev = regulator->rdev;
2255 int ret = 0;
414c70cb 2256
6492bc1b
MB		 2257 if (regulator->always_on)
2258 return 0;
2259
412aec61 2260 mutex_lock(&rdev->mutex);
3801b86a 2261 ret = _regulator_disable(rdev);
412aec61 2262 mutex_unlock(&rdev->mutex);
8cbf811d 2263
3801b86a
MB		 2264 if (ret == 0 && rdev->supply)
2265 regulator_disable(rdev->supply);
8cbf811d 2266
414c70cb
LG		 2267 return ret;
2268}
2269EXPORT_SYMBOL_GPL(regulator_disable);
2270
2271/* locks held by regulator_force_disable() */
3801b86a 2272static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 2273{
2274 int ret = 0;
2275
70cfef26
KK		 2276 lockdep_assert_held_once(&rdev->mutex);
2277
a1c8a551
RF		 2278 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2279 REGULATOR_EVENT_PRE_DISABLE, NULL);
2280 if (ret & NOTIFY_STOP_MASK)
2281 return -EINVAL;
2282
66fda75f
MP		 2283 ret = _regulator_do_disable(rdev);
2284 if (ret < 0) {
2285 rdev_err(rdev, "failed to force disable\n");
a1c8a551
RF		 2286 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2287 REGULATOR_EVENT_ABORT_DISABLE, NULL);
66fda75f 2288 return ret;
414c70cb
LG		 2289 }
2290
66fda75f
MP		 2291 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2292 REGULATOR_EVENT_DISABLE, NULL);
2293
2294 return 0;
414c70cb
LG		 2295}
2296
2297/**
2298 * regulator_force_disable - force disable regulator output
2299 * @regulator: regulator source
2300 *
2301 * Forcibly disable the regulator output voltage or current.
2302 * NOTE: this *will* disable the regulator output even if other consumer
2303 * devices have it enabled. This should be used for situations when device
2304 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2305 */
2306int regulator_force_disable(struct regulator *regulator)
2307{
82d15839 2308 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 2309 int ret;
2310
82d15839 2311 mutex_lock(&rdev->mutex);
414c70cb 2312 regulator->uA_load = 0;
3801b86a 2313 ret = _regulator_force_disable(regulator->rdev);
82d15839 2314 mutex_unlock(&rdev->mutex);
8cbf811d 2315
3801b86a
MB		 2316 if (rdev->supply)
2317 while (rdev->open_count--)
2318 regulator_disable(rdev->supply);
8cbf811d 2319
414c70cb
LG		 2320 return ret;
2321}
2322EXPORT_SYMBOL_GPL(regulator_force_disable);
2323
da07ecd9
MB		 2324static void regulator_disable_work(struct work_struct *work)
2325{
2326 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2327 disable_work.work);
2328 int count, i, ret;
2329
2330 mutex_lock(&rdev->mutex);
2331
2332 BUG_ON(!rdev->deferred_disables);
2333
2334 count = rdev->deferred_disables;
2335 rdev->deferred_disables = 0;
2336
2337 for (i = 0; i < count; i++) {
2338 ret = _regulator_disable(rdev);
2339 if (ret != 0)
2340 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2341 }
2342
2343 mutex_unlock(&rdev->mutex);
2344
2345 if (rdev->supply) {
2346 for (i = 0; i < count; i++) {
2347 ret = regulator_disable(rdev->supply);
2348 if (ret != 0) {
2349 rdev_err(rdev,
2350 "Supply disable failed: %d\n", ret);
2351 }
2352 }
2353 }
2354}
2355
2356/**
2357 * regulator_disable_deferred - disable regulator output with delay
2358 * @regulator: regulator source
2359 * @ms: miliseconds until the regulator is disabled
2360 *
2361 * Execute regulator_disable() on the regulator after a delay. This
2362 * is intended for use with devices that require some time to quiesce.
2363 *
2364 * NOTE: this will only disable the regulator output if no other consumer
2365 * devices have it enabled, the regulator device supports disabling and
2366 * machine constraints permit this operation.
2367 */
2368int regulator_disable_deferred(struct regulator *regulator, int ms)
2369{
2370 struct regulator_dev *rdev = regulator->rdev;
2371
6492bc1b
MB		 2372 if (regulator->always_on)
2373 return 0;
2374
2b5a24a0
MB		 2375 if (!ms)
2376 return regulator_disable(regulator);
2377
da07ecd9
MB		 2378 mutex_lock(&rdev->mutex);
2379 rdev->deferred_disables++;
2380 mutex_unlock(&rdev->mutex);
2381
70dc6daf
DC		 2382 queue_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2383 msecs_to_jiffies(ms));
2384 return 0;
da07ecd9
MB		 2385}
2386EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2387
414c70cb
LG		 2388static int _regulator_is_enabled(struct regulator_dev *rdev)
2389{
65f73508 2390 /* A GPIO control always takes precedence */
7b74d149 2391 if (rdev->ena_pin)
65f73508
MB		 2392 return rdev->ena_gpio_state;
2393
9a7f6a4c 2394 /* If we don't know then assume that the regulator is always on */
9332546f 2395 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 2396 return 1;
414c70cb 2397
9332546f 2398 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 2399}
2400
3a40cfc3
SH		 2401static int _regulator_list_voltage(struct regulator *regulator,
2402 unsigned selector, int lock)
2403{
2404 struct regulator_dev *rdev = regulator->rdev;
2405 const struct regulator_ops *ops = rdev->desc->ops;
2406 int ret;
2407
2408 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2409 return rdev->desc->fixed_uV;
2410
2411 if (ops->list_voltage) {
2412 if (selector >= rdev->desc->n_voltages)
2413 return -EINVAL;
2414 if (lock)
2415 mutex_lock(&rdev->mutex);
2416 ret = ops->list_voltage(rdev, selector);
2417 if (lock)
2418 mutex_unlock(&rdev->mutex);
2419 } else if (rdev->supply) {
2420 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2421 } else {
2422 return -EINVAL;
2423 }
2424
2425 if (ret > 0) {
2426 if (ret < rdev->constraints->min_uV)
2427 ret = 0;
2428 else if (ret > rdev->constraints->max_uV)
2429 ret = 0;
2430 }
2431
2432 return ret;
2433}
2434
414c70cb
LG		 2435/**
2436 * regulator_is_enabled - is the regulator output enabled
2437 * @regulator: regulator source
2438 *
412aec61
DB		 2439 * Returns positive if the regulator driver backing the source/client
2440 * has requested that the device be enabled, zero if it hasn't, else a
2441 * negative errno code.
2442 *
2443 * Note that the device backing this regulator handle can have multiple
2444 * users, so it might be enabled even if regulator_enable() was never
2445 * called for this particular source.
414c70cb
LG		 2446 */
2447int regulator_is_enabled(struct regulator *regulator)
2448{
9332546f
MB		 2449 int ret;
2450
6492bc1b
MB		 2451 if (regulator->always_on)
2452 return 1;
2453
9332546f
MB		 2454 mutex_lock(&regulator->rdev->mutex);
2455 ret = _regulator_is_enabled(regulator->rdev);
2456 mutex_unlock(&regulator->rdev->mutex);
2457
2458 return ret;
414c70cb
LG		 2459}
2460EXPORT_SYMBOL_GPL(regulator_is_enabled);
2461
d1e7de30
MS		 2462/**
2463 * regulator_can_change_voltage - check if regulator can change voltage
2464 * @regulator: regulator source
2465 *
2466 * Returns positive if the regulator driver backing the source/client
e227867f 2467 * can change its voltage, false otherwise. Useful for detecting fixed
d1e7de30
MS		 2468 * or dummy regulators and disabling voltage change logic in the client
2469 * driver.
2470 */
2471int regulator_can_change_voltage(struct regulator *regulator)
2472{
2473 struct regulator_dev *rdev = regulator->rdev;
2474
2475 if (rdev->constraints &&
19280e40
AL		 2476 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2477 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2478 return 1;
2479
2480 if (rdev->desc->continuous_voltage_range &&
2481 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2482 rdev->constraints->min_uV != rdev->constraints->max_uV)
2483 return 1;
2484 }
d1e7de30
MS		 2485
2486 return 0;
2487}
2488EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2489
4367cfdc
DB		 2490/**
2491 * regulator_count_voltages - count regulator_list_voltage() selectors
2492 * @regulator: regulator source
2493 *
2494 * Returns number of selectors, or negative errno. Selectors are
2495 * numbered starting at zero, and typically correspond to bitfields
2496 * in hardware registers.
2497 */
2498int regulator_count_voltages(struct regulator *regulator)
2499{
2500 struct regulator_dev *rdev = regulator->rdev;
2501
26988efe
JMC		 2502 if (rdev->desc->n_voltages)
2503 return rdev->desc->n_voltages;
2504
2505 if (!rdev->supply)
2506 return -EINVAL;
2507
2508 return regulator_count_voltages(rdev->supply);
4367cfdc
DB		 2509}
2510EXPORT_SYMBOL_GPL(regulator_count_voltages);
2511
2512/**
2513 * regulator_list_voltage - enumerate supported voltages
2514 * @regulator: regulator source
2515 * @selector: identify voltage to list
2516 * Context: can sleep
2517 *
2518 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 2519 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 2520 * negative errno.
2521 */
2522int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2523{
3a40cfc3 2524 return _regulator_list_voltage(regulator, selector, 1);
4367cfdc
DB		 2525}
2526EXPORT_SYMBOL_GPL(regulator_list_voltage);
2527
04eca28c
TT		 2528/**
2529 * regulator_get_regmap - get the regulator's register map
2530 * @regulator: regulator source
2531 *
2532 * Returns the register map for the given regulator, or an ERR_PTR value
2533 * if the regulator doesn't use regmap.
2534 */
2535struct regmap *regulator_get_regmap(struct regulator *regulator)
2536{
2537 struct regmap *map = regulator->rdev->regmap;
2538
2539 return map ? map : ERR_PTR(-EOPNOTSUPP);
2540}
2541
2542/**
2543 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2544 * @regulator: regulator source
2545 * @vsel_reg: voltage selector register, output parameter
2546 * @vsel_mask: mask for voltage selector bitfield, output parameter
2547 *
2548 * Returns the hardware register offset and bitmask used for setting the
2549 * regulator voltage. This might be useful when configuring voltage-scaling
2550 * hardware or firmware that can make I2C requests behind the kernel's back,
2551 * for example.
2552 *
2553 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2554 * and 0 is returned, otherwise a negative errno is returned.
2555 */
2556int regulator_get_hardware_vsel_register(struct regulator *regulator,
2557 unsigned *vsel_reg,
2558 unsigned *vsel_mask)
2559{
39f5460d
GX		 2560 struct regulator_dev *rdev = regulator->rdev;
2561 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 2562
2563 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2564 return -EOPNOTSUPP;
2565
2566 *vsel_reg = rdev->desc->vsel_reg;
2567 *vsel_mask = rdev->desc->vsel_mask;
2568
2569 return 0;
2570}
2571EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2572
2573/**
2574 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2575 * @regulator: regulator source
2576 * @selector: identify voltage to list
2577 *
2578 * Converts the selector to a hardware-specific voltage selector that can be
2579 * directly written to the regulator registers. The address of the voltage
2580 * register can be determined by calling @regulator_get_hardware_vsel_register.
2581 *
2582 * On error a negative errno is returned.
2583 */
2584int regulator_list_hardware_vsel(struct regulator *regulator,
2585 unsigned selector)
2586{
39f5460d
GX		 2587 struct regulator_dev *rdev = regulator->rdev;
2588 const struct regulator_ops *ops = rdev->desc->ops;
04eca28c
TT		 2589
2590 if (selector >= rdev->desc->n_voltages)
2591 return -EINVAL;
2592 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2593 return -EOPNOTSUPP;
2594
2595 return selector;
2596}
2597EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2598
2a668a8b
PW		 2599/**
2600 * regulator_get_linear_step - return the voltage step size between VSEL values
2601 * @regulator: regulator source
2602 *
2603 * Returns the voltage step size between VSEL values for linear
2604 * regulators, or return 0 if the regulator isn't a linear regulator.
2605 */
2606unsigned int regulator_get_linear_step(struct regulator *regulator)
2607{
2608 struct regulator_dev *rdev = regulator->rdev;
2609
2610 return rdev->desc->uV_step;
2611}
2612EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2613
a7a1ad90
MB		 2614/**
2615 * regulator_is_supported_voltage - check if a voltage range can be supported
2616 *
2617 * @regulator: Regulator to check.
2618 * @min_uV: Minimum required voltage in uV.
2619 * @max_uV: Maximum required voltage in uV.
2620 *
2621 * Returns a boolean or a negative error code.
2622 */
2623int regulator_is_supported_voltage(struct regulator *regulator,
2624 int min_uV, int max_uV)
2625{
c5f3939b 2626 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 2627 int i, voltages, ret;
2628
c5f3939b
MB		 2629 /* If we can't change voltage check the current voltage */
2630 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2631 ret = regulator_get_voltage(regulator);
2632 if (ret >= 0)
0d25d09d 2633 return min_uV <= ret && ret <= max_uV;
c5f3939b
MB		 2634 else
2635 return ret;
2636 }
2637
bd7a2b60
PM		 2638 /* Any voltage within constrains range is fine? */
2639 if (rdev->desc->continuous_voltage_range)
2640 return min_uV >= rdev->constraints->min_uV &&
2641 max_uV <= rdev->constraints->max_uV;
2642
a7a1ad90
MB		 2643 ret = regulator_count_voltages(regulator);
2644 if (ret < 0)
2645 return ret;
2646 voltages = ret;
2647
2648 for (i = 0; i < voltages; i++) {
2649 ret = regulator_list_voltage(regulator, i);
2650
2651 if (ret >= min_uV && ret <= max_uV)
2652 return 1;
2653 }
2654
2655 return 0;
2656}
a398eaa2 2657EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 2658
a204f41e
SH		 2659static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2660 int max_uV)
2661{
2662 const struct regulator_desc *desc = rdev->desc;
2663
2664 if (desc->ops->map_voltage)
2665 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2666
2667 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2668 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2669
2670 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2671 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2672
2673 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2674}
2675
7179569a
HS		 2676static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2677 int min_uV, int max_uV,
2678 unsigned *selector)
2679{
2680 struct pre_voltage_change_data data;
2681 int ret;
2682
2683 data.old_uV = _regulator_get_voltage(rdev);
2684 data.min_uV = min_uV;
2685 data.max_uV = max_uV;
2686 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2687 &data);
2688 if (ret & NOTIFY_STOP_MASK)
2689 return -EINVAL;
2690
2691 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2692 if (ret >= 0)
2693 return ret;
2694
2695 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2696 (void *)data.old_uV);
2697
2698 return ret;
2699}
2700
2701static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2702 int uV, unsigned selector)
2703{
2704 struct pre_voltage_change_data data;
2705 int ret;
2706
2707 data.old_uV = _regulator_get_voltage(rdev);
2708 data.min_uV = uV;
2709 data.max_uV = uV;
2710 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2711 &data);
2712 if (ret & NOTIFY_STOP_MASK)
2713 return -EINVAL;
2714
2715 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2716 if (ret >= 0)
2717 return ret;
2718
2719 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2720 (void *)data.old_uV);
2721
2722 return ret;
2723}
2724
75790251
MB		 2725static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2726 int min_uV, int max_uV)
2727{
2728 int ret;
77af1b26 2729 int delay = 0;
e113d792 2730 int best_val = 0;
75790251 2731 unsigned int selector;
eba41a5e 2732 int old_selector = -1;
75790251
MB		 2733
2734 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2735
bf5892a8
MB		 2736 min_uV += rdev->constraints->uV_offset;
2737 max_uV += rdev->constraints->uV_offset;
2738
eba41a5e
AL		 2739 /*
2740 * If we can't obtain the old selector there is not enough
2741 * info to call set_voltage_time_sel().
2742 */
8b7485ef
AL		 2743 if (_regulator_is_enabled(rdev) &&
2744 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2745 rdev->desc->ops->get_voltage_sel) {
2746 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2747 if (old_selector < 0)
2748 return old_selector;
2749 }
2750
75790251 2751 if (rdev->desc->ops->set_voltage) {
7179569a
HS		 2752 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2753 &selector);
e113d792
MB		 2754
2755 if (ret >= 0) {
2756 if (rdev->desc->ops->list_voltage)
2757 best_val = rdev->desc->ops->list_voltage(rdev,
2758 selector);
2759 else
2760 best_val = _regulator_get_voltage(rdev);
2761 }
2762
e8eef82b 2763 } else if (rdev->desc->ops->set_voltage_sel) {
a204f41e 2764 ret = regulator_map_voltage(rdev, min_uV, max_uV);
e843fc46 2765 if (ret >= 0) {
e113d792
MB		 2766 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2767 if (min_uV <= best_val && max_uV >= best_val) {
2768 selector = ret;
c66a566a
AL		 2769 if (old_selector == selector)
2770 ret = 0;
2771 else
7179569a
HS		 2772 ret = _regulator_call_set_voltage_sel(
2773 rdev, best_val, selector);
e113d792
MB		 2774 } else {
2775 ret = -EINVAL;
2776 }
e8eef82b 2777 }
75790251
MB		 2778 } else {
2779 ret = -EINVAL;
2780 }
e8eef82b 2781
eba41a5e 2782 /* Call set_voltage_time_sel if successfully obtained old_selector */
5b175952
YSB		 2783 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2784 && old_selector != selector) {
77af1b26 2785
eba41a5e
AL		 2786 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2787 old_selector, selector);
2788 if (delay < 0) {
2789 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2790 delay);
2791 delay = 0;
e8eef82b 2792 }
75790251 2793
8b96de31
PR		 2794 /* Insert any necessary delays */
2795 if (delay >= 1000) {
2796 mdelay(delay / 1000);
2797 udelay(delay % 1000);
2798 } else if (delay) {
2799 udelay(delay);
2800 }
77af1b26
LW		 2801 }
2802
2f6c797f
AL		 2803 if (ret == 0 && best_val >= 0) {
2804 unsigned long data = best_val;
2805
ded06a52 2806 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 2807 (void *)data);
2808 }
ded06a52 2809
eba41a5e 2810 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2811
2812 return ret;
2813}
2814
a9f226bc
SH		 2815static int regulator_set_voltage_unlocked(struct regulator *regulator,
2816 int min_uV, int max_uV)
414c70cb
LG		 2817{
2818 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2819 int ret = 0;
92d7a558 2820 int old_min_uV, old_max_uV;
c00dc359 2821 int current_uV;
fc42112c
SH		 2822 int best_supply_uV = 0;
2823 int supply_change_uV = 0;
414c70cb 2824
95a3c23a
MB		 2825 /* If we're setting the same range as last time the change
2826 * should be a noop (some cpufreq implementations use the same
2827 * voltage for multiple frequencies, for example).
2828 */
2829 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2830 goto out;
2831
c00dc359 2832 /* If we're trying to set a range that overlaps the current voltage,
d3fb9800 2833 * return successfully even though the regulator does not support
c00dc359
BA		 2834 * changing the voltage.
2835 */
2836 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2837 current_uV = _regulator_get_voltage(rdev);
2838 if (min_uV <= current_uV && current_uV <= max_uV) {
2839 regulator->min_uV = min_uV;
2840 regulator->max_uV = max_uV;
2841 goto out;
2842 }
2843 }
2844
414c70cb 2845 /* sanity check */
e8eef82b
MB		 2846 if (!rdev->desc->ops->set_voltage &&
2847 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2848 ret = -EINVAL;
2849 goto out;
2850 }
2851
2852 /* constraints check */
2853 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2854 if (ret < 0)
2855 goto out;
0d25d09d 2856
92d7a558
PP		 2857 /* restore original values in case of error */
2858 old_min_uV = regulator->min_uV;
2859 old_max_uV = regulator->max_uV;
414c70cb
LG		 2860 regulator->min_uV = min_uV;
2861 regulator->max_uV = max_uV;
3a93f2a9 2862
05fda3b1
TP		 2863 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2864 if (ret < 0)
92d7a558 2865 goto out2;
05fda3b1 2866
fc42112c
SH		 2867 if (rdev->supply && (rdev->desc->min_dropout_uV ||
2868 !rdev->desc->ops->get_voltage)) {
2869 int current_supply_uV;
2870 int selector;
2871
2872 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2873 if (selector < 0) {
2874 ret = selector;
2875 goto out2;
2876 }
2877
2878 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2879 if (best_supply_uV < 0) {
2880 ret = best_supply_uV;
2881 goto out2;
2882 }
2883
2884 best_supply_uV += rdev->desc->min_dropout_uV;
2885
2886 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2887 if (current_supply_uV < 0) {
2888 ret = current_supply_uV;
2889 goto out2;
2890 }
2891
2892 supply_change_uV = best_supply_uV - current_supply_uV;
2893 }
2894
2895 if (supply_change_uV > 0) {
2896 ret = regulator_set_voltage_unlocked(rdev->supply,
2897 best_supply_uV, INT_MAX);
2898 if (ret) {
2899 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2900 ret);
2901 goto out2;
2902 }
2903 }
2904
75790251 2905 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
92d7a558
PP		 2906 if (ret < 0)
2907 goto out2;
0d25d09d 2908
fc42112c
SH		 2909 if (supply_change_uV < 0) {
2910 ret = regulator_set_voltage_unlocked(rdev->supply,
2911 best_supply_uV, INT_MAX);
2912 if (ret)
2913 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2914 ret);
2915 /* No need to fail here */
2916 ret = 0;
2917 }
2918
414c70cb 2919out:
414c70cb 2920 return ret;
92d7a558
PP		 2921out2:
2922 regulator->min_uV = old_min_uV;
2923 regulator->max_uV = old_max_uV;
a9f226bc
SH		 2924
2925 return ret;
2926}
2927
2928/**
2929 * regulator_set_voltage - set regulator output voltage
2930 * @regulator: regulator source
2931 * @min_uV: Minimum required voltage in uV
2932 * @max_uV: Maximum acceptable voltage in uV
2933 *
2934 * Sets a voltage regulator to the desired output voltage. This can be set
2935 * during any regulator state. IOW, regulator can be disabled or enabled.
2936 *
2937 * If the regulator is enabled then the voltage will change to the new value
2938 * immediately otherwise if the regulator is disabled the regulator will
2939 * output at the new voltage when enabled.
2940 *
2941 * NOTE: If the regulator is shared between several devices then the lowest
2942 * request voltage that meets the system constraints will be used.
2943 * Regulator system constraints must be set for this regulator before
2944 * calling this function otherwise this call will fail.
2945 */
2946int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2947{
2948 int ret = 0;
2949
fc42112c 2950 regulator_lock_supply(regulator->rdev);
a9f226bc
SH		 2951
2952 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
2953
fc42112c 2954 regulator_unlock_supply(regulator->rdev);
a9f226bc 2955
414c70cb
LG		 2956 return ret;
2957}
2958EXPORT_SYMBOL_GPL(regulator_set_voltage);
2959
88cd222b
LW		 2960/**
2961 * regulator_set_voltage_time - get raise/fall time
2962 * @regulator: regulator source
2963 * @old_uV: starting voltage in microvolts
2964 * @new_uV: target voltage in microvolts
2965 *
2966 * Provided with the starting and ending voltage, this function attempts to
2967 * calculate the time in microseconds required to rise or fall to this new
2968 * voltage.
2969 */
2970int regulator_set_voltage_time(struct regulator *regulator,
2971 int old_uV, int new_uV)
2972{
272e2315
GX		 2973 struct regulator_dev *rdev = regulator->rdev;
2974 const struct regulator_ops *ops = rdev->desc->ops;
88cd222b
LW		 2975 int old_sel = -1;
2976 int new_sel = -1;
2977 int voltage;
2978 int i;
2979
2980 /* Currently requires operations to do this */
2981 if (!ops->list_voltage || !ops->set_voltage_time_sel
2982 || !rdev->desc->n_voltages)
2983 return -EINVAL;
2984
2985 for (i = 0; i < rdev->desc->n_voltages; i++) {
2986 /* We only look for exact voltage matches here */
2987 voltage = regulator_list_voltage(regulator, i);
2988 if (voltage < 0)
2989 return -EINVAL;
2990 if (voltage == 0)
2991 continue;
2992 if (voltage == old_uV)
2993 old_sel = i;
2994 if (voltage == new_uV)
2995 new_sel = i;
2996 }
2997
2998 if (old_sel < 0 || new_sel < 0)
2999 return -EINVAL;
3000
3001 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3002}
3003EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3004
98a175b6 3005/**
296c6566
RD		 3006 * regulator_set_voltage_time_sel - get raise/fall time
3007 * @rdev: regulator source device
98a175b6
YSB		 3008 * @old_selector: selector for starting voltage
3009 * @new_selector: selector for target voltage
3010 *
3011 * Provided with the starting and target voltage selectors, this function
3012 * returns time in microseconds required to rise or fall to this new voltage
3013 *
f11d08c3 3014 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 3015 * set_voltage_time_sel() operation.
98a175b6
YSB		 3016 */
3017int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3018 unsigned int old_selector,
3019 unsigned int new_selector)
3020{
398715ab 3021 unsigned int ramp_delay = 0;
f11d08c3 3022 int old_volt, new_volt;
398715ab
AL		 3023
3024 if (rdev->constraints->ramp_delay)
3025 ramp_delay = rdev->constraints->ramp_delay;
3026 else if (rdev->desc->ramp_delay)
3027 ramp_delay = rdev->desc->ramp_delay;
3028
3029 if (ramp_delay == 0) {
6f0b2c69 3030 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 3031 return 0;
6f0b2c69 3032 }
398715ab 3033
f11d08c3
AL		 3034 /* sanity check */
3035 if (!rdev->desc->ops->list_voltage)
3036 return -EINVAL;
398715ab 3037
f11d08c3
AL		 3038 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3039 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3040
3041 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
98a175b6 3042}
b19dbf71 3043EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 3044
606a2562
MB		 3045/**
3046 * regulator_sync_voltage - re-apply last regulator output voltage
3047 * @regulator: regulator source
3048 *
3049 * Re-apply the last configured voltage. This is intended to be used
3050 * where some external control source the consumer is cooperating with
3051 * has caused the configured voltage to change.
3052 */
3053int regulator_sync_voltage(struct regulator *regulator)
3054{
3055 struct regulator_dev *rdev = regulator->rdev;
3056 int ret, min_uV, max_uV;
3057
3058 mutex_lock(&rdev->mutex);
3059
3060 if (!rdev->desc->ops->set_voltage &&
3061 !rdev->desc->ops->set_voltage_sel) {
3062 ret = -EINVAL;
3063 goto out;
3064 }
3065
3066 /* This is only going to work if we've had a voltage configured. */
3067 if (!regulator->min_uV && !regulator->max_uV) {
3068 ret = -EINVAL;
3069 goto out;
3070 }
3071
3072 min_uV = regulator->min_uV;
3073 max_uV = regulator->max_uV;
3074
3075 /* This should be a paranoia check... */
3076 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3077 if (ret < 0)
3078 goto out;
3079
3080 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3081 if (ret < 0)
3082 goto out;
3083
3084 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3085
3086out:
3087 mutex_unlock(&rdev->mutex);
3088 return ret;
3089}
3090EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3091
414c70cb
LG		 3092static int _regulator_get_voltage(struct regulator_dev *rdev)
3093{
bf5892a8 3094 int sel, ret;
476c2d83
MB		 3095
3096 if (rdev->desc->ops->get_voltage_sel) {
3097 sel = rdev->desc->ops->get_voltage_sel(rdev);
3098 if (sel < 0)
3099 return sel;
bf5892a8 3100 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 3101 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 3102 ret = rdev->desc->ops->get_voltage(rdev);
f7df20ec
MB		 3103 } else if (rdev->desc->ops->list_voltage) {
3104 ret = rdev->desc->ops->list_voltage(rdev, 0);
5a523605
LD		 3105 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3106 ret = rdev->desc->fixed_uV;
e303996e 3107 } else if (rdev->supply) {
d9b96d35 3108 ret = _regulator_get_voltage(rdev->supply->rdev);
cb220d16 3109 } else {
414c70cb 3110 return -EINVAL;
cb220d16 3111 }
bf5892a8 3112
cb220d16
AL		 3113 if (ret < 0)
3114 return ret;
bf5892a8 3115 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 3116}
3117
3118/**
3119 * regulator_get_voltage - get regulator output voltage
3120 * @regulator: regulator source
3121 *
3122 * This returns the current regulator voltage in uV.
3123 *
3124 * NOTE: If the regulator is disabled it will return the voltage value. This
3125 * function should not be used to determine regulator state.
3126 */
3127int regulator_get_voltage(struct regulator *regulator)
3128{
3129 int ret;
3130
d9b96d35 3131 regulator_lock_supply(regulator->rdev);
414c70cb
LG		 3132
3133 ret = _regulator_get_voltage(regulator->rdev);
3134
d9b96d35 3135 regulator_unlock_supply(regulator->rdev);
414c70cb
LG		 3136
3137 return ret;
3138}
3139EXPORT_SYMBOL_GPL(regulator_get_voltage);
3140
3141/**
3142 * regulator_set_current_limit - set regulator output current limit
3143 * @regulator: regulator source
ce0d10f8 3144 * @min_uA: Minimum supported current in uA
414c70cb
LG		 3145 * @max_uA: Maximum supported current in uA
3146 *
3147 * Sets current sink to the desired output current. This can be set during
3148 * any regulator state. IOW, regulator can be disabled or enabled.
3149 *
3150 * If the regulator is enabled then the current will change to the new value
3151 * immediately otherwise if the regulator is disabled the regulator will
3152 * output at the new current when enabled.
3153 *
3154 * NOTE: Regulator system constraints must be set for this regulator before
3155 * calling this function otherwise this call will fail.
3156 */
3157int regulator_set_current_limit(struct regulator *regulator,
3158 int min_uA, int max_uA)
3159{
3160 struct regulator_dev *rdev = regulator->rdev;
3161 int ret;
3162
3163 mutex_lock(&rdev->mutex);
3164
3165 /* sanity check */
3166 if (!rdev->desc->ops->set_current_limit) {
3167 ret = -EINVAL;
3168 goto out;
3169 }
3170
3171 /* constraints check */
3172 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3173 if (ret < 0)
3174 goto out;
3175
3176 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3177out:
3178 mutex_unlock(&rdev->mutex);
3179 return ret;
3180}
3181EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3182
3183static int _regulator_get_current_limit(struct regulator_dev *rdev)
3184{
3185 int ret;
3186
3187 mutex_lock(&rdev->mutex);
3188
3189 /* sanity check */
3190 if (!rdev->desc->ops->get_current_limit) {
3191 ret = -EINVAL;
3192 goto out;
3193 }
3194
3195 ret = rdev->desc->ops->get_current_limit(rdev);
3196out:
3197 mutex_unlock(&rdev->mutex);
3198 return ret;
3199}
3200
3201/**
3202 * regulator_get_current_limit - get regulator output current
3203 * @regulator: regulator source
3204 *
3205 * This returns the current supplied by the specified current sink in uA.
3206 *
3207 * NOTE: If the regulator is disabled it will return the current value. This
3208 * function should not be used to determine regulator state.
3209 */
3210int regulator_get_current_limit(struct regulator *regulator)
3211{
3212 return _regulator_get_current_limit(regulator->rdev);
3213}
3214EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3215
3216/**
3217 * regulator_set_mode - set regulator operating mode
3218 * @regulator: regulator source
3219 * @mode: operating mode - one of the REGULATOR_MODE constants
3220 *
3221 * Set regulator operating mode to increase regulator efficiency or improve
3222 * regulation performance.
3223 *
3224 * NOTE: Regulator system constraints must be set for this regulator before
3225 * calling this function otherwise this call will fail.
3226 */
3227int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3228{
3229 struct regulator_dev *rdev = regulator->rdev;
3230 int ret;
500b4ac9 3231 int regulator_curr_mode;
414c70cb
LG		 3232
3233 mutex_lock(&rdev->mutex);
3234
3235 /* sanity check */
3236 if (!rdev->desc->ops->set_mode) {
3237 ret = -EINVAL;
3238 goto out;
3239 }
3240
500b4ac9
SI		 3241 /* return if the same mode is requested */
3242 if (rdev->desc->ops->get_mode) {
3243 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3244 if (regulator_curr_mode == mode) {
3245 ret = 0;
3246 goto out;
3247 }
3248 }
3249
414c70cb 3250 /* constraints check */
22c51b47 3251 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 3252 if (ret < 0)
3253 goto out;
3254
3255 ret = rdev->desc->ops->set_mode(rdev, mode);
3256out:
3257 mutex_unlock(&rdev->mutex);
3258 return ret;
3259}
3260EXPORT_SYMBOL_GPL(regulator_set_mode);
3261
3262static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3263{
3264 int ret;
3265
3266 mutex_lock(&rdev->mutex);
3267
3268 /* sanity check */
3269 if (!rdev->desc->ops->get_mode) {
3270 ret = -EINVAL;
3271 goto out;
3272 }
3273
3274 ret = rdev->desc->ops->get_mode(rdev);
3275out:
3276 mutex_unlock(&rdev->mutex);
3277 return ret;
3278}
3279
3280/**
3281 * regulator_get_mode - get regulator operating mode
3282 * @regulator: regulator source
3283 *
3284 * Get the current regulator operating mode.
3285 */
3286unsigned int regulator_get_mode(struct regulator *regulator)
3287{
3288 return _regulator_get_mode(regulator->rdev);
3289}
3290EXPORT_SYMBOL_GPL(regulator_get_mode);
3291
3292/**
e39ce48f 3293 * regulator_set_load - set regulator load
414c70cb
LG		 3294 * @regulator: regulator source
3295 * @uA_load: load current
3296 *
3297 * Notifies the regulator core of a new device load. This is then used by
3298 * DRMS (if enabled by constraints) to set the most efficient regulator
3299 * operating mode for the new regulator loading.
3300 *
3301 * Consumer devices notify their supply regulator of the maximum power
3302 * they will require (can be taken from device datasheet in the power
3303 * consumption tables) when they change operational status and hence power
3304 * state. Examples of operational state changes that can affect power
3305 * consumption are :-
3306 *
3307 * o Device is opened / closed.
3308 * o Device I/O is about to begin or has just finished.
3309 * o Device is idling in between work.
3310 *
3311 * This information is also exported via sysfs to userspace.
3312 *
3313 * DRMS will sum the total requested load on the regulator and change
3314 * to the most efficient operating mode if platform constraints allow.
3315 *
e39ce48f 3316 * On error a negative errno is returned.
414c70cb 3317 */
e39ce48f 3318int regulator_set_load(struct regulator *regulator, int uA_load)
414c70cb
LG		 3319{
3320 struct regulator_dev *rdev = regulator->rdev;
8460ef38 3321 int ret;
d92d95b6 3322
414c70cb 3323 mutex_lock(&rdev->mutex);
414c70cb 3324 regulator->uA_load = uA_load;
8460ef38 3325 ret = drms_uA_update(rdev);
414c70cb 3326 mutex_unlock(&rdev->mutex);
8460ef38 3327
414c70cb
LG		 3328 return ret;
3329}
e39ce48f 3330EXPORT_SYMBOL_GPL(regulator_set_load);
414c70cb 3331
f59c8f9f
MB		 3332/**
3333 * regulator_allow_bypass - allow the regulator to go into bypass mode
3334 *
3335 * @regulator: Regulator to configure
9345dfb8 3336 * @enable: enable or disable bypass mode
f59c8f9f
MB		 3337 *
3338 * Allow the regulator to go into bypass mode if all other consumers
3339 * for the regulator also enable bypass mode and the machine
3340 * constraints allow this. Bypass mode means that the regulator is
3341 * simply passing the input directly to the output with no regulation.
3342 */
3343int regulator_allow_bypass(struct regulator *regulator, bool enable)
3344{
3345 struct regulator_dev *rdev = regulator->rdev;
3346 int ret = 0;
3347
3348 if (!rdev->desc->ops->set_bypass)
3349 return 0;
3350
3351 if (rdev->constraints &&
3352 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3353 return 0;
3354
3355 mutex_lock(&rdev->mutex);
3356
3357 if (enable && !regulator->bypass) {
3358 rdev->bypass_count++;
3359
3360 if (rdev->bypass_count == rdev->open_count) {
3361 ret = rdev->desc->ops->set_bypass(rdev, enable);
3362 if (ret != 0)
3363 rdev->bypass_count--;
3364 }
3365
3366 } else if (!enable && regulator->bypass) {
3367 rdev->bypass_count--;
3368
3369 if (rdev->bypass_count != rdev->open_count) {
3370 ret = rdev->desc->ops->set_bypass(rdev, enable);
3371 if (ret != 0)
3372 rdev->bypass_count++;
3373 }
3374 }
3375
3376 if (ret == 0)
3377 regulator->bypass = enable;
3378
3379 mutex_unlock(&rdev->mutex);
3380
3381 return ret;
3382}
3383EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3384
414c70cb
LG		 3385/**
3386 * regulator_register_notifier - register regulator event notifier
3387 * @regulator: regulator source
69279fb9 3388 * @nb: notifier block
414c70cb
LG		 3389 *
3390 * Register notifier block to receive regulator events.
3391 */
3392int regulator_register_notifier(struct regulator *regulator,
3393 struct notifier_block *nb)
3394{
3395 return blocking_notifier_chain_register(&regulator->rdev->notifier,
3396 nb);
3397}
3398EXPORT_SYMBOL_GPL(regulator_register_notifier);
3399
3400/**
3401 * regulator_unregister_notifier - unregister regulator event notifier
3402 * @regulator: regulator source
69279fb9 3403 * @nb: notifier block
414c70cb
LG		 3404 *
3405 * Unregister regulator event notifier block.
3406 */
3407int regulator_unregister_notifier(struct regulator *regulator,
3408 struct notifier_block *nb)
3409{
3410 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3411 nb);
3412}
3413EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3414
b136fb44
JC		 3415/* notify regulator consumers and downstream regulator consumers.
3416 * Note mutex must be held by caller.
3417 */
7179569a 3418static int _notifier_call_chain(struct regulator_dev *rdev,
414c70cb
LG		 3419 unsigned long event, void *data)
3420{
414c70cb 3421 /* call rdev chain first */
7179569a 3422 return blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 3423}
3424
3425/**
3426 * regulator_bulk_get - get multiple regulator consumers
3427 *
3428 * @dev: Device to supply
3429 * @num_consumers: Number of consumers to register
3430 * @consumers: Configuration of consumers; clients are stored here.
3431 *
3432 * @return 0 on success, an errno on failure.
3433 *
3434 * This helper function allows drivers to get several regulator
3435 * consumers in one operation. If any of the regulators cannot be
3436 * acquired then any regulators that were allocated will be freed
3437 * before returning to the caller.
3438 */
3439int regulator_bulk_get(struct device *dev, int num_consumers,
3440 struct regulator_bulk_data *consumers)
3441{
3442 int i;
3443 int ret;
3444
3445 for (i = 0; i < num_consumers; i++)
3446 consumers[i].consumer = NULL;
3447
3448 for (i = 0; i < num_consumers; i++) {
3ff3f518
BA		 3449 consumers[i].consumer = _regulator_get(dev,
3450 consumers[i].supply,
3451 false,
3452 !consumers[i].optional);
414c70cb 3453 if (IS_ERR(consumers[i].consumer)) {
414c70cb 3454 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 3455 dev_err(dev, "Failed to get supply '%s': %d\n",
3456 consumers[i].supply, ret);
414c70cb
LG		 3457 consumers[i].consumer = NULL;
3458 goto err;
3459 }
3460 }
3461
3462 return 0;
3463
3464err:
b29c7690 3465 while (--i >= 0)
414c70cb
LG		 3466 regulator_put(consumers[i].consumer);
3467
3468 return ret;
3469}
3470EXPORT_SYMBOL_GPL(regulator_bulk_get);
3471
f21e0e81
MB		 3472static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3473{
3474 struct regulator_bulk_data *bulk = data;
3475
3476 bulk->ret = regulator_enable(bulk->consumer);
3477}
3478
414c70cb
LG		 3479/**
3480 * regulator_bulk_enable - enable multiple regulator consumers
3481 *
3482 * @num_consumers: Number of consumers
3483 * @consumers: Consumer data; clients are stored here.
3484 * @return 0 on success, an errno on failure
3485 *
3486 * This convenience API allows consumers to enable multiple regulator
3487 * clients in a single API call. If any consumers cannot be enabled
3488 * then any others that were enabled will be disabled again prior to
3489 * return.
3490 */
3491int regulator_bulk_enable(int num_consumers,
3492 struct regulator_bulk_data *consumers)
3493{
2955b47d 3494 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 3495 int i;
f21e0e81 3496 int ret = 0;
414c70cb 3497
6492bc1b
MB		 3498 for (i = 0; i < num_consumers; i++) {
3499 if (consumers[i].consumer->always_on)
3500 consumers[i].ret = 0;
3501 else
3502 async_schedule_domain(regulator_bulk_enable_async,
3503 &consumers[i], &async_domain);
3504 }
f21e0e81
MB		 3505
3506 async_synchronize_full_domain(&async_domain);
3507
3508 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 3509 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 3510 if (consumers[i].ret != 0) {
3511 ret = consumers[i].ret;
414c70cb 3512 goto err;
f21e0e81 3513 }
414c70cb
LG		 3514 }
3515
3516 return 0;
3517
3518err:
fbe31057
AH		 3519 for (i = 0; i < num_consumers; i++) {
3520 if (consumers[i].ret < 0)
3521 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3522 consumers[i].ret);
3523 else
3524 regulator_disable(consumers[i].consumer);
3525 }
414c70cb
LG		 3526
3527 return ret;
3528}
3529EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3530
3531/**
3532 * regulator_bulk_disable - disable multiple regulator consumers
3533 *
3534 * @num_consumers: Number of consumers
3535 * @consumers: Consumer data; clients are stored here.
3536 * @return 0 on success, an errno on failure
3537 *
3538 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 3539 * clients in a single API call. If any consumers cannot be disabled
3540 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 3541 * return.
3542 */
3543int regulator_bulk_disable(int num_consumers,
3544 struct regulator_bulk_data *consumers)
3545{
3546 int i;
01e86f49 3547 int ret, r;
414c70cb 3548
49e22632 3549 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 3550 ret = regulator_disable(consumers[i].consumer);
3551 if (ret != 0)
3552 goto err;
3553 }
3554
3555 return 0;
3556
3557err:
5da84fd9 3558 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 3559 for (++i; i < num_consumers; ++i) {
3560 r = regulator_enable(consumers[i].consumer);
3561 if (r != 0)
3562 pr_err("Failed to reename %s: %d\n",
3563 consumers[i].supply, r);
3564 }
414c70cb
LG		 3565
3566 return ret;
3567}
3568EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3569
e1de2f42
DK		 3570/**
3571 * regulator_bulk_force_disable - force disable multiple regulator consumers
3572 *
3573 * @num_consumers: Number of consumers
3574 * @consumers: Consumer data; clients are stored here.
3575 * @return 0 on success, an errno on failure
3576 *
3577 * This convenience API allows consumers to forcibly disable multiple regulator
3578 * clients in a single API call.
3579 * NOTE: This should be used for situations when device damage will
3580 * likely occur if the regulators are not disabled (e.g. over temp).
3581 * Although regulator_force_disable function call for some consumers can
3582 * return error numbers, the function is called for all consumers.
3583 */
3584int regulator_bulk_force_disable(int num_consumers,
3585 struct regulator_bulk_data *consumers)
3586{
3587 int i;
3588 int ret;
3589
3590 for (i = 0; i < num_consumers; i++)
3591 consumers[i].ret =
3592 regulator_force_disable(consumers[i].consumer);
3593
3594 for (i = 0; i < num_consumers; i++) {
3595 if (consumers[i].ret != 0) {
3596 ret = consumers[i].ret;
3597 goto out;
3598 }
3599 }
3600
3601 return 0;
3602out:
3603 return ret;
3604}
3605EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3606
414c70cb
LG		 3607/**
3608 * regulator_bulk_free - free multiple regulator consumers
3609 *
3610 * @num_consumers: Number of consumers
3611 * @consumers: Consumer data; clients are stored here.
3612 *
3613 * This convenience API allows consumers to free multiple regulator
3614 * clients in a single API call.
3615 */
3616void regulator_bulk_free(int num_consumers,
3617 struct regulator_bulk_data *consumers)
3618{
3619 int i;
3620
3621 for (i = 0; i < num_consumers; i++) {
3622 regulator_put(consumers[i].consumer);
3623 consumers[i].consumer = NULL;
3624 }
3625}
3626EXPORT_SYMBOL_GPL(regulator_bulk_free);
3627
3628/**
3629 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 3630 * @rdev: regulator source
414c70cb 3631 * @event: notifier block
69279fb9 3632 * @data: callback-specific data.
414c70cb
LG		 3633 *
3634 * Called by regulator drivers to notify clients a regulator event has
3635 * occurred. We also notify regulator clients downstream.
b136fb44 3636 * Note lock must be held by caller.
414c70cb
LG		 3637 */
3638int regulator_notifier_call_chain(struct regulator_dev *rdev,
3639 unsigned long event, void *data)
3640{
70cfef26
KK		 3641 lockdep_assert_held_once(&rdev->mutex);
3642
414c70cb
LG		 3643 _notifier_call_chain(rdev, event, data);
3644 return NOTIFY_DONE;
3645
3646}
3647EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3648
be721979
MB		 3649/**
3650 * regulator_mode_to_status - convert a regulator mode into a status
3651 *
3652 * @mode: Mode to convert
3653 *
3654 * Convert a regulator mode into a status.
3655 */
3656int regulator_mode_to_status(unsigned int mode)
3657{
3658 switch (mode) {
3659 case REGULATOR_MODE_FAST:
3660 return REGULATOR_STATUS_FAST;
3661 case REGULATOR_MODE_NORMAL:
3662 return REGULATOR_STATUS_NORMAL;
3663 case REGULATOR_MODE_IDLE:
3664 return REGULATOR_STATUS_IDLE;
03ffcf3d 3665 case REGULATOR_MODE_STANDBY:
be721979
MB		 3666 return REGULATOR_STATUS_STANDBY;
3667 default:
1beaf762 3668 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 3669 }
3670}
3671EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3672
39f802d6
TI		 3673static struct attribute *regulator_dev_attrs[] = {
3674 &dev_attr_name.attr,
3675 &dev_attr_num_users.attr,
3676 &dev_attr_type.attr,
3677 &dev_attr_microvolts.attr,
3678 &dev_attr_microamps.attr,
3679 &dev_attr_opmode.attr,
3680 &dev_attr_state.attr,
3681 &dev_attr_status.attr,
3682 &dev_attr_bypass.attr,
3683 &dev_attr_requested_microamps.attr,
3684 &dev_attr_min_microvolts.attr,
3685 &dev_attr_max_microvolts.attr,
3686 &dev_attr_min_microamps.attr,
3687 &dev_attr_max_microamps.attr,
3688 &dev_attr_suspend_standby_state.attr,
3689 &dev_attr_suspend_mem_state.attr,
3690 &dev_attr_suspend_disk_state.attr,
3691 &dev_attr_suspend_standby_microvolts.attr,
3692 &dev_attr_suspend_mem_microvolts.attr,
3693 &dev_attr_suspend_disk_microvolts.attr,
3694 &dev_attr_suspend_standby_mode.attr,
3695 &dev_attr_suspend_mem_mode.attr,
3696 &dev_attr_suspend_disk_mode.attr,
3697 NULL
3698};
3699
7ad68e2f
DB		 3700/*
3701 * To avoid cluttering sysfs (and memory) with useless state, only
3702 * create attributes that can be meaningfully displayed.
3703 */
39f802d6
TI		 3704static umode_t regulator_attr_is_visible(struct kobject *kobj,
3705 struct attribute *attr, int idx)
7ad68e2f 3706{
39f802d6 3707 struct device *dev = kobj_to_dev(kobj);
83080a14 3708 struct regulator_dev *rdev = dev_to_rdev(dev);
272e2315 3709 const struct regulator_ops *ops = rdev->desc->ops;
39f802d6
TI		 3710 umode_t mode = attr->mode;
3711
3712 /* these three are always present */
3713 if (attr == &dev_attr_name.attr ||
3714 attr == &dev_attr_num_users.attr ||
3715 attr == &dev_attr_type.attr)
3716 return mode;
7ad68e2f
DB		 3717
3718 /* some attributes need specific methods to be displayed */
39f802d6
TI		 3719 if (attr == &dev_attr_microvolts.attr) {
3720 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3721 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3722 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3723 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3724 return mode;
3725 return 0;
f59c8f9f 3726 }
7ad68e2f 3727
39f802d6
TI		 3728 if (attr == &dev_attr_microamps.attr)
3729 return ops->get_current_limit ? mode : 0;
3730
3731 if (attr == &dev_attr_opmode.attr)
3732 return ops->get_mode ? mode : 0;
3733
3734 if (attr == &dev_attr_state.attr)
3735 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3736
3737 if (attr == &dev_attr_status.attr)
3738 return ops->get_status ? mode : 0;
3739
3740 if (attr == &dev_attr_bypass.attr)
3741 return ops->get_bypass ? mode : 0;
3742
7ad68e2f 3743 /* some attributes are type-specific */
39f802d6
TI		 3744 if (attr == &dev_attr_requested_microamps.attr)
3745 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
7ad68e2f 3746
7ad68e2f 3747 /* constraints need specific supporting methods */
39f802d6
TI		 3748 if (attr == &dev_attr_min_microvolts.attr ||
3749 attr == &dev_attr_max_microvolts.attr)
3750 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3751
3752 if (attr == &dev_attr_min_microamps.attr ||
3753 attr == &dev_attr_max_microamps.attr)
3754 return ops->set_current_limit ? mode : 0;
3755
3756 if (attr == &dev_attr_suspend_standby_state.attr ||
3757 attr == &dev_attr_suspend_mem_state.attr ||
3758 attr == &dev_attr_suspend_disk_state.attr)
3759 return mode;
3760
3761 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3762 attr == &dev_attr_suspend_mem_microvolts.attr ||
3763 attr == &dev_attr_suspend_disk_microvolts.attr)
3764 return ops->set_suspend_voltage ? mode : 0;
3765
3766 if (attr == &dev_attr_suspend_standby_mode.attr ||
3767 attr == &dev_attr_suspend_mem_mode.attr ||
3768 attr == &dev_attr_suspend_disk_mode.attr)
3769 return ops->set_suspend_mode ? mode : 0;
3770
3771 return mode;
3772}
3773
3774static const struct attribute_group regulator_dev_group = {
3775 .attrs = regulator_dev_attrs,
3776 .is_visible = regulator_attr_is_visible,
3777};
3778
3779static const struct attribute_group *regulator_dev_groups[] = {
3780 &regulator_dev_group,
3781 NULL
3782};
7ad68e2f 3783
39f802d6
TI		 3784static void regulator_dev_release(struct device *dev)
3785{
3786 struct regulator_dev *rdev = dev_get_drvdata(dev);
29f5f486
MB		 3787
3788 kfree(rdev->constraints);
3789 of_node_put(rdev->dev.of_node);
39f802d6 3790 kfree(rdev);
7ad68e2f
DB		 3791}
3792
39f802d6
TI		 3793static struct class regulator_class = {
3794 .name = "regulator",
3795 .dev_release = regulator_dev_release,
3796 .dev_groups = regulator_dev_groups,
3797};
3798
1130e5b3
MB		 3799static void rdev_init_debugfs(struct regulator_dev *rdev)
3800{
a9eaa813
GR		 3801 struct device *parent = rdev->dev.parent;
3802 const char *rname = rdev_get_name(rdev);
3803 char name[NAME_MAX];
3804
3805 /* Avoid duplicate debugfs directory names */
3806 if (parent && rname == rdev->desc->name) {
3807 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3808 rname);
3809 rname = name;
3810 }
3811
3812 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
24751434 3813 if (!rdev->debugfs) {
1130e5b3 3814 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3815 return;
3816 }
3817
3818 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3819 &rdev->use_count);
3820 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3821 &rdev->open_count);
f59c8f9f
MB		 3822 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3823 &rdev->bypass_count);
1130e5b3
MB		 3824}
3825
414c70cb
LG		 3826/**
3827 * regulator_register - register regulator
69279fb9 3828 * @regulator_desc: regulator to register
f47531b1 3829 * @cfg: runtime configuration for regulator
414c70cb
LG		 3830 *
3831 * Called by regulator drivers to register a regulator.
0384618a
AL		 3832 * Returns a valid pointer to struct regulator_dev on success
3833 * or an ERR_PTR() on error.
414c70cb 3834 */
65f26846
MB		 3835struct regulator_dev *
3836regulator_register(const struct regulator_desc *regulator_desc,
1b3de223 3837 const struct regulator_config *cfg)
414c70cb 3838{
9a8f5e07 3839 const struct regulation_constraints *constraints = NULL;
c172708d 3840 const struct regulator_init_data *init_data;
1b3de223 3841 struct regulator_config *config = NULL;
72dca06f 3842 static atomic_t regulator_no = ATOMIC_INIT(-1);
414c70cb 3843 struct regulator_dev *rdev;
32c8fad4 3844 struct device *dev;
a5766f11 3845 int ret, i;
414c70cb 3846
1b3de223 3847 if (regulator_desc == NULL || cfg == NULL)
414c70cb
LG		 3848 return ERR_PTR(-EINVAL);
3849
1b3de223 3850 dev = cfg->dev;
dcf70112 3851 WARN_ON(!dev);
32c8fad4 3852
414c70cb
LG		 3853 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3854 return ERR_PTR(-EINVAL);
3855
cd78dfc6
DL		 3856 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3857 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3858 return ERR_PTR(-EINVAL);
3859
476c2d83
MB		 3860 /* Only one of each should be implemented */
3861 WARN_ON(regulator_desc->ops->get_voltage &&
3862 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3863 WARN_ON(regulator_desc->ops->set_voltage &&
3864 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3865
3866 /* If we're using selectors we must implement list_voltage. */
3867 if (regulator_desc->ops->get_voltage_sel &&
3868 !regulator_desc->ops->list_voltage) {
3869 return ERR_PTR(-EINVAL);
3870 }
e8eef82b
MB		 3871 if (regulator_desc->ops->set_voltage_sel &&
3872 !regulator_desc->ops->list_voltage) {
3873 return ERR_PTR(-EINVAL);
3874 }
476c2d83 3875
414c70cb
LG		 3876 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3877 if (rdev == NULL)
3878 return ERR_PTR(-ENOMEM);
3879
1b3de223
KK		 3880 /*
3881 * Duplicate the config so the driver could override it after
3882 * parsing init data.
3883 */
3884 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
3885 if (config == NULL) {
3886 kfree(rdev);
3887 return ERR_PTR(-ENOMEM);
3888 }
3889
bfa21a0d 3890 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
a0c7b164
MB		 3891 &rdev->dev.of_node);
3892 if (!init_data) {
3893 init_data = config->init_data;
3894 rdev->dev.of_node = of_node_get(config->of_node);
3895 }
3896
414c70cb
LG		 3897 mutex_lock(&regulator_list_mutex);
3898
3899 mutex_init(&rdev->mutex);
c172708d 3900 rdev->reg_data = config->driver_data;
414c70cb
LG		 3901 rdev->owner = regulator_desc->owner;
3902 rdev->desc = regulator_desc;
3a4b0a07
MB		 3903 if (config->regmap)
3904 rdev->regmap = config->regmap;
52b84dac 3905 else if (dev_get_regmap(dev, NULL))
3a4b0a07 3906 rdev->regmap = dev_get_regmap(dev, NULL);
52b84dac
AC		 3907 else if (dev->parent)
3908 rdev->regmap = dev_get_regmap(dev->parent, NULL);
414c70cb 3909 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3910 INIT_LIST_HEAD(&rdev->list);
414c70cb 3911 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3912 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3913
a5766f11 3914 /* preform any regulator specific init */
9a8f5e07 3915 if (init_data && init_data->regulator_init) {
a5766f11 3916 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3917 if (ret < 0)
3918 goto clean;
a5766f11
LG		 3919 }
3920
a5766f11 3921 /* register with sysfs */
414c70cb 3922 rdev->dev.class = &regulator_class;
a5766f11 3923 rdev->dev.parent = dev;
72dca06f 3924 dev_set_name(&rdev->dev, "regulator.%lu",
39138818 3925 (unsigned long) atomic_inc_return(&regulator_no));
a5766f11 3926 ret = device_register(&rdev->dev);
ad7725cb
VK		 3927 if (ret != 0) {
3928 put_device(&rdev->dev);
4fca9545 3929 goto clean;
ad7725cb 3930 }
a5766f11
LG		 3931
3932 dev_set_drvdata(&rdev->dev, rdev);
3933
76f439df
MP		 3934 if ((config->ena_gpio || config->ena_gpio_initialized) &&
3935 gpio_is_valid(config->ena_gpio)) {
f19b00da 3936 ret = regulator_ena_gpio_request(rdev, config);
65f73508
MB		 3937 if (ret != 0) {
3938 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3939 config->ena_gpio, ret);
b2da55d9 3940 goto wash;
65f73508 3941 }
65f73508
MB		 3942 }
3943
74f544c1 3944 /* set regulator constraints */
9a8f5e07
MB		 3945 if (init_data)
3946 constraints = &init_data->constraints;
3947
3948 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3949 if (ret < 0)
3950 goto scrub;
3951
9a8f5e07 3952 if (init_data && init_data->supply_regulator)
6261b06d 3953 rdev->supply_name = init_data->supply_regulator;
69511a45 3954 else if (regulator_desc->supply_name)
6261b06d 3955 rdev->supply_name = regulator_desc->supply_name;
0178f3e2 3956
a5766f11 3957 /* add consumers devices */
9a8f5e07
MB		 3958 if (init_data) {
3959 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3960 ret = set_consumer_device_supply(rdev,
9a8f5e07 3961 init_data->consumer_supplies[i].dev_name,
23c2f041 3962 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3963 if (ret < 0) {
3964 dev_err(dev, "Failed to set supply %s\n",
3965 init_data->consumer_supplies[i].supply);
3966 goto unset_supplies;
3967 }
23c2f041 3968 }
414c70cb 3969 }
a5766f11 3970
1130e5b3 3971 rdev_init_debugfs(rdev);
a5766f11 3972out:
414c70cb 3973 mutex_unlock(&regulator_list_mutex);
1b3de223 3974 kfree(config);
414c70cb 3975 return rdev;
4fca9545 3976
d4033b54
JN		 3977unset_supplies:
3978 unset_regulator_supplies(rdev);
3979
4fca9545 3980scrub:
f19b00da 3981 regulator_ena_gpio_free(rdev);
1a6958e7 3982 kfree(rdev->constraints);
b2da55d9 3983wash:
4fca9545 3984 device_unregister(&rdev->dev);
53032daf
PW		 3985 /* device core frees rdev */
3986 rdev = ERR_PTR(ret);
3987 goto out;
3988
4fca9545
DB		 3989clean:
3990 kfree(rdev);
3991 rdev = ERR_PTR(ret);
3992 goto out;
414c70cb
LG		 3993}
3994EXPORT_SYMBOL_GPL(regulator_register);
3995
3996/**
3997 * regulator_unregister - unregister regulator
69279fb9 3998 * @rdev: regulator to unregister
414c70cb
LG		 3999 *
4000 * Called by regulator drivers to unregister a regulator.
4001 */
4002void regulator_unregister(struct regulator_dev *rdev)
4003{
4004 if (rdev == NULL)
4005 return;
4006
891636ea
MB		 4007 if (rdev->supply) {
4008 while (rdev->use_count--)
4009 regulator_disable(rdev->supply);
e032b376 4010 regulator_put(rdev->supply);
891636ea 4011 }
414c70cb 4012 mutex_lock(&regulator_list_mutex);
1130e5b3 4013 debugfs_remove_recursive(rdev->debugfs);
43829731 4014 flush_work(&rdev->disable_work.work);
6bf87d17 4015 WARN_ON(rdev->open_count);
0f1d747b 4016 unset_regulator_supplies(rdev);
414c70cb 4017 list_del(&rdev->list);
7cd71c3b 4018 mutex_unlock(&regulator_list_mutex);
f19b00da 4019 regulator_ena_gpio_free(rdev);
58fb5cf5 4020 device_unregister(&rdev->dev);
414c70cb
LG		 4021}
4022EXPORT_SYMBOL_GPL(regulator_unregister);
4023
85f3b431
TV		 4024static int _regulator_suspend_prepare(struct device *dev, void *data)
4025{
4026 struct regulator_dev *rdev = dev_to_rdev(dev);
4027 const suspend_state_t *state = data;
4028 int ret;
4029
4030 mutex_lock(&rdev->mutex);
4031 ret = suspend_prepare(rdev, *state);
4032 mutex_unlock(&rdev->mutex);
4033
4034 return ret;
4035}
4036
414c70cb 4037/**
cf7bbcdf 4038 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 4039 * @state: system suspend state
4040 *
4041 * Configure each regulator with it's suspend operating parameters for state.
4042 * This will usually be called by machine suspend code prior to supending.
4043 */
4044int regulator_suspend_prepare(suspend_state_t state)
4045{
414c70cb
LG		 4046 /* ON is handled by regulator active state */
4047 if (state == PM_SUSPEND_ON)
4048 return -EINVAL;
4049
85f3b431
TV		 4050 return class_for_each_device(&regulator_class, NULL, &state,
4051 _regulator_suspend_prepare);
4052}
4053EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
414c70cb 4054
85f3b431
TV		 4055static int _regulator_suspend_finish(struct device *dev, void *data)
4056{
4057 struct regulator_dev *rdev = dev_to_rdev(dev);
4058 int ret;
414c70cb 4059
85f3b431
TV		 4060 mutex_lock(&rdev->mutex);
4061 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4062 if (!_regulator_is_enabled(rdev)) {
4063 ret = _regulator_do_enable(rdev);
4064 if (ret)
4065 dev_err(dev,
4066 "Failed to resume regulator %d\n",
4067 ret);
414c70cb 4068 }
85f3b431
TV		 4069 } else {
4070 if (!have_full_constraints())
4071 goto unlock;
4072 if (!_regulator_is_enabled(rdev))
4073 goto unlock;
4074
4075 ret = _regulator_do_disable(rdev);
4076 if (ret)
4077 dev_err(dev, "Failed to suspend regulator %d\n", ret);
414c70cb 4078 }
85f3b431
TV		 4079unlock:
4080 mutex_unlock(&rdev->mutex);
4081
4082 /* Keep processing regulators in spite of any errors */
4083 return 0;
414c70cb 4084}
414c70cb 4085
7a32b589
MH		 4086/**
4087 * regulator_suspend_finish - resume regulators from system wide suspend
4088 *
4089 * Turn on regulators that might be turned off by regulator_suspend_prepare
4090 * and that should be turned on according to the regulators properties.
4091 */
4092int regulator_suspend_finish(void)
4093{
85f3b431
TV		 4094 return class_for_each_device(&regulator_class, NULL, NULL,
4095 _regulator_suspend_finish);
7a32b589
MH		 4096}
4097EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4098
ca725561
MB		 4099/**
4100 * regulator_has_full_constraints - the system has fully specified constraints
4101 *
4102 * Calling this function will cause the regulator API to disable all
4103 * regulators which have a zero use count and don't have an always_on
4104 * constraint in a late_initcall.
4105 *
4106 * The intention is that this will become the default behaviour in a
4107 * future kernel release so users are encouraged to use this facility
4108 * now.
4109 */
4110void regulator_has_full_constraints(void)
4111{
4112 has_full_constraints = 1;
4113}
4114EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4115
414c70cb
LG		 4116/**
4117 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 4118 * @rdev: regulator
414c70cb
LG		 4119 *
4120 * Get rdev regulator driver private data. This call can be used in the
4121 * regulator driver context.
4122 */
4123void *rdev_get_drvdata(struct regulator_dev *rdev)
4124{
4125 return rdev->reg_data;
4126}
4127EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4128
4129/**
4130 * regulator_get_drvdata - get regulator driver data
4131 * @regulator: regulator
4132 *
4133 * Get regulator driver private data. This call can be used in the consumer
4134 * driver context when non API regulator specific functions need to be called.
4135 */
4136void *regulator_get_drvdata(struct regulator *regulator)
4137{
4138 return regulator->rdev->reg_data;
4139}
4140EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4141
4142/**
4143 * regulator_set_drvdata - set regulator driver data
4144 * @regulator: regulator
4145 * @data: data
4146 */
4147void regulator_set_drvdata(struct regulator *regulator, void *data)
4148{
4149 regulator->rdev->reg_data = data;
4150}
4151EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4152
4153/**
4154 * regulator_get_id - get regulator ID
69279fb9 4155 * @rdev: regulator
414c70cb
LG		 4156 */
4157int rdev_get_id(struct regulator_dev *rdev)
4158{
4159 return rdev->desc->id;
4160}
4161EXPORT_SYMBOL_GPL(rdev_get_id);
4162
a5766f11
LG		 4163struct device *rdev_get_dev(struct regulator_dev *rdev)
4164{
4165 return &rdev->dev;
4166}
4167EXPORT_SYMBOL_GPL(rdev_get_dev);
4168
4169void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4170{
4171 return reg_init_data->driver_data;
4172}
4173EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4174
ba55a974
MB		 4175#ifdef CONFIG_DEBUG_FS
4176static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4177 size_t count, loff_t *ppos)
4178{
4179 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4180 ssize_t len, ret = 0;
4181 struct regulator_map *map;
4182
4183 if (!buf)
4184 return -ENOMEM;
4185
4186 list_for_each_entry(map, &regulator_map_list, list) {
4187 len = snprintf(buf + ret, PAGE_SIZE - ret,
4188 "%s -> %s.%s\n",
4189 rdev_get_name(map->regulator), map->dev_name,
4190 map->supply);
4191 if (len >= 0)
4192 ret += len;
4193 if (ret > PAGE_SIZE) {
4194 ret = PAGE_SIZE;
4195 break;
4196 }
4197 }
4198
4199 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4200
4201 kfree(buf);
4202
4203 return ret;
4204}
24751434 4205#endif
ba55a974
MB		 4206
4207static const struct file_operations supply_map_fops = {
24751434 4208#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 4209 .read = supply_map_read_file,
4210 .llseek = default_llseek,
ba55a974 4211#endif
24751434 4212};
ba55a974 4213
7c225ec9 4214#ifdef CONFIG_DEBUG_FS
85f3b431
TV		 4215struct summary_data {
4216 struct seq_file *s;
4217 struct regulator_dev *parent;
4218 int level;
4219};
4220
4221static void regulator_summary_show_subtree(struct seq_file *s,
4222 struct regulator_dev *rdev,
4223 int level);
4224
4225static int regulator_summary_show_children(struct device *dev, void *data)
4226{
4227 struct regulator_dev *rdev = dev_to_rdev(dev);
4228 struct summary_data *summary_data = data;
4229
4230 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4231 regulator_summary_show_subtree(summary_data->s, rdev,
4232 summary_data->level + 1);
4233
4234 return 0;
4235}
4236
7c225ec9
HS		 4237static void regulator_summary_show_subtree(struct seq_file *s,
4238 struct regulator_dev *rdev,
4239 int level)
4240{
7c225ec9
HS		 4241 struct regulation_constraints *c;
4242 struct regulator *consumer;
85f3b431 4243 struct summary_data summary_data;
7c225ec9
HS		 4244
4245 if (!rdev)
4246 return;
4247
7c225ec9
HS		 4248 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4249 level * 3 + 1, "",
4250 30 - level * 3, rdev_get_name(rdev),
4251 rdev->use_count, rdev->open_count, rdev->bypass_count);
4252
23296099
HS		 4253 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4254 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
7c225ec9
HS		 4255
4256 c = rdev->constraints;
4257 if (c) {
4258 switch (rdev->desc->type) {
4259 case REGULATOR_VOLTAGE:
4260 seq_printf(s, "%5dmV %5dmV ",
4261 c->min_uV / 1000, c->max_uV / 1000);
4262 break;
4263 case REGULATOR_CURRENT:
4264 seq_printf(s, "%5dmA %5dmA ",
4265 c->min_uA / 1000, c->max_uA / 1000);
4266 break;
4267 }
4268 }
4269
4270 seq_puts(s, "\n");
4271
4272 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4273 if (consumer->dev->class == &regulator_class)
4274 continue;
4275
4276 seq_printf(s, "%*s%-*s ",
4277 (level + 1) * 3 + 1, "",
4278 30 - (level + 1) * 3, dev_name(consumer->dev));
4279
4280 switch (rdev->desc->type) {
4281 case REGULATOR_VOLTAGE:
23296099 4282 seq_printf(s, "%37dmV %5dmV",
7c225ec9
HS		 4283 consumer->min_uV / 1000,
4284 consumer->max_uV / 1000);
4285 break;
4286 case REGULATOR_CURRENT:
7c225ec9
HS		 4287 break;
4288 }
4289
4290 seq_puts(s, "\n");
4291 }
4292
85f3b431
TV		 4293 summary_data.s = s;
4294 summary_data.level = level;
4295 summary_data.parent = rdev;
7c225ec9 4296
85f3b431
TV		 4297 class_for_each_device(&regulator_class, NULL, &summary_data,
4298 regulator_summary_show_children);
7c225ec9
HS		 4299}
4300
85f3b431 4301static int regulator_summary_show_roots(struct device *dev, void *data)
7c225ec9 4302{
85f3b431
TV		 4303 struct regulator_dev *rdev = dev_to_rdev(dev);
4304 struct seq_file *s = data;
7c225ec9 4305
85f3b431
TV		 4306 if (!rdev->supply)
4307 regulator_summary_show_subtree(s, rdev, 0);
7c225ec9 4308
85f3b431
TV		 4309 return 0;
4310}
7c225ec9 4311
85f3b431
TV		 4312static int regulator_summary_show(struct seq_file *s, void *data)
4313{
4314 seq_puts(s, " regulator use open bypass voltage current min max\n");
4315 seq_puts(s, "-------------------------------------------------------------------------------\n");
7c225ec9 4316
85f3b431
TV		 4317 class_for_each_device(&regulator_class, NULL, s,
4318 regulator_summary_show_roots);
7c225ec9
HS		 4319
4320 return 0;
4321}
4322
4323static int regulator_summary_open(struct inode *inode, struct file *file)
4324{
4325 return single_open(file, regulator_summary_show, inode->i_private);
4326}
4327#endif
4328
4329static const struct file_operations regulator_summary_fops = {
4330#ifdef CONFIG_DEBUG_FS
4331 .open = regulator_summary_open,
4332 .read = seq_read,
4333 .llseek = seq_lseek,
4334 .release = single_release,
4335#endif
4336};
4337
414c70cb
LG		 4338static int __init regulator_init(void)
4339{
34abbd68
MB		 4340 int ret;
4341
34abbd68
MB		 4342 ret = class_register(&regulator_class);
4343
1130e5b3 4344 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 4345 if (!debugfs_root)
1130e5b3 4346 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 4347
f4d562c6
MB		 4348 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4349 &supply_map_fops);
1130e5b3 4350
7c225ec9 4351 debugfs_create_file("regulator_summary", 0444, debugfs_root,
85f3b431 4352 NULL, &regulator_summary_fops);
7c225ec9 4353
34abbd68
MB		 4354 regulator_dummy_init();
4355
4356 return ret;
414c70cb
LG		 4357}
4358
4359/* init early to allow our consumers to complete system booting */
4360core_initcall(regulator_init);
ca725561 4361
609ca5f3 4362static int __init regulator_late_cleanup(struct device *dev, void *data)
ca725561 4363{
609ca5f3
MB		 4364 struct regulator_dev *rdev = dev_to_rdev(dev);
4365 const struct regulator_ops *ops = rdev->desc->ops;
4366 struct regulation_constraints *c = rdev->constraints;
ca725561 4367 int enabled, ret;
ca725561 4368
609ca5f3
MB		 4369 if (c && c->always_on)
4370 return 0;
4371
4372 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4373 return 0;
4374
4375 mutex_lock(&rdev->mutex);
4376
4377 if (rdev->use_count)
4378 goto unlock;
4379
4380 /* If we can't read the status assume it's on. */
4381 if (ops->is_enabled)
4382 enabled = ops->is_enabled(rdev);
4383 else
4384 enabled = 1;
4385
4386 if (!enabled)
4387 goto unlock;
4388
4389 if (have_full_constraints()) {
4390 /* We log since this may kill the system if it goes
4391 * wrong. */
4392 rdev_info(rdev, "disabling\n");
4393 ret = _regulator_do_disable(rdev);
4394 if (ret != 0)
4395 rdev_err(rdev, "couldn't disable: %d\n", ret);
4396 } else {
4397 /* The intention is that in future we will
4398 * assume that full constraints are provided
4399 * so warn even if we aren't going to do
4400 * anything here.
4401 */
4402 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4403 }
4404
4405unlock:
4406 mutex_unlock(&rdev->mutex);
4407
4408 return 0;
4409}
4410
4411static int __init regulator_init_complete(void)
4412{
86f5fcfc
MB		 4413 /*
4414 * Since DT doesn't provide an idiomatic mechanism for
4415 * enabling full constraints and since it's much more natural
4416 * with DT to provide them just assume that a DT enabled
4417 * system has full constraints.
4418 */
4419 if (of_have_populated_dt())
4420 has_full_constraints = true;
4421
ca725561 4422 /* If we have a full configuration then disable any regulators
e9535834
MB		 4423 * we have permission to change the status for and which are
4424 * not in use or always_on. This is effectively the default
4425 * for DT and ACPI as they have full constraints.
ca725561 4426 */
609ca5f3
MB		 4427 class_for_each_device(&regulator_class, NULL, NULL,
4428 regulator_late_cleanup);
ca725561
MB		 4429
4430 return 0;
4431}
fd482a3e 4432late_initcall_sync(regulator_init_complete);
Linux kernel - Deliverables
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